ADVANCED NMR SYSTEMS INC
8-K, 1997-01-23
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                          SECURITIES AND EXCHANGE COMMISSION

                                WASHINGTON, D.C. 20549


                                       FORM 8-K


                                    CURRENT REPORT
                          PURSUANT TO SECTION 13 OR 15(D) OF
                         THE SECURITIES EXCHANGE ACT OF 1934



          DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED) JANUARY 20, 1997





                              ADVANCED NMR SYSTEMS, INC.
                (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


               DELAWARE                 0-11914               22-2457487   
        -------------------    --------------------------- ----------------
            (STATE OR OTHER            (COMMISSION         (I.R.S. EMPLOYER
             JURISDICTION             FILE NUMBER)        IDENTIFICATION NO.)
           OF INCORPORATION)


                       46 JONSPIN ROAD, WILMINGTON, MA  01887         
            -------------------------------------------------------------
                 (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)  (ZIP CODE)


          REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE (508) 657-8876
                                                              --------------- 






<PAGE> 


          ITEM 5.   OTHER EVENTS.
                    -------------
                    On January 20, 1997, Advanced NMR Systems, Inc., a
          Delaware corporation (the "Company") and its wholly-owned
          subsidiary Medical Diagnostics, Inc., a Delaware corporation
          ("MDI"), entered into an Agreement and Plan of Merger (the
          "Merger Agreement") with US Diagnostic Inc., a Delaware
          corporation ("USD") and its newly-formed wholly-owned subsidiary
          MDI Acquisition Corporation, a Delaware corporation
          ("Acquisition").  The Merger Agreement provides for the merger
          (the "Merger") of Acquisition with and into MDI with MDI being
          the surviving corporation of the Merger, and accordingly, MDI
          would become a wholly-owned subsidiary of USD.  The Merger would
          become effective (the "Effective Time") upon the completion (or
          waiver) of the closing conditions set forth in the Merger
          Agreement.

                    At the Effective Time, in conversion of the MDI shares
          upon the Merger, USD shall pay the Company $22,000,000 (the
          "Merger Consideration") as follows: (i) to Chase Manhattan Bank
          N.A. (the "Bank"), on behalf of the Company and MDI, an amount
          sufficient to fully satisfy all of the Company's and MDI's
          obligations to the Bank (approximately $12,000,000) and (ii) the 
          remainder (approximately $10,000,000) to the Company.  As a
          result of the Merger, USD will also be assuming approximately
          $10,000,000 in payment obligations under MDI's capital leases.

                    Prior to entering into the Merger Agreement, the
          Company engaged in extensive discussions and negotiations with
          possible  acquirors.  USD had proposed the most attractive offer
          among the possible acquirors.  The amount of the Merger
          Consideration was determined through arms-length negotiations
          with USD.  Prior to the entry into the Merger Agreement there had
          not been any relationship by either the Company or MDI with USD.

                    After the Merger the Company will continue to provide
          the existing rehabilitation services by retaining such business. 
          Immediately prior to the Effective Time, MDI will assign to the
          Company its entire interest in MDI Rehab, Inc., MDI's wholly-
          owned subsidiary that is engaged in the rehabilitation services
          business. In addition, MDI will also cause one of its
          subsidiaries to assign to the Company all of such subsidiary's
          agreements relating to MDI's and such subsidiary's activities at
          Faulkner Hospital Sagoff Women's Center.  The Company will assume
          all liabilities of MDI and its subsidiaries relating to such
          assignments. 

                    Each party to the Merger Agreement agreed to indemnify
          the other for all losses resulting from any breach or violation
          of any of the representations, warranties, covenants or
          agreements contained in the Merger Agreement and any actions,
          suits, proceedings and related costs and expenses incidental
          thereto.  The respective indemnification obligations expire 18
          months after the date of the Merger Agreement, except that with
          respect to tax and certain other specified matters (the "Excluded
          Matters"), the indemnification obligation would survive for the
          applicable statutory periods.  In addition, a party's
          indemnification obligation is only triggered (i) if and only to
          the extent that the aggregate of all claims made against such
          party exceeds $500,000 (the "Basket Limitation") and (ii) up to a
          maximum cap of $3,000,000 (the "Cap").  These dollar limitations
          or survival restrictions would not apply to the Excluded Matters
          or to certain indemnification obligations relating to (i) MDI's
          ongoing litigation with Raytel Corporation (the "Raytel
          Litigation"), (ii) all claims of John Lynch, former Chief
          Executive Officer of MDI, against MDI and its affiliates and
          (iii) certain assumed employee agreements.

                    In the event that MDI is awarded and receives any
          monetary damages in the Raytel Litigation, the Company would be
          entitled to receive the net amount of such monetary award to the
          extent that it has met its indemnification obligations to USD and
          MDI under the special indemnification provisions relating to the
          Raytel Litigation (the "Raytel Indemnification Obligations"). 
          Prior to the Closing MDI will cause one of its subsidiaries to
          assign to the Company all of such subsidiary's rights in and to
          an escrow fund in the amount of $510,000, which relates to a
          settlement amount received by the MDI venture with Raytel.  Also,
          to secure its Raytel Indemnification Obligations, the Company
          agreed to transfer $1,000,000 of the Merger Consideration into a
          blocked bank account and to pledge 1,250,000 shares (the "Pledged
          Shares") of Advanced Mammography Systems, Inc. common stock owned
          by the Company.  The pledged collateral would be released upon a
          settlement or a judgment on the merits by a trial court of the
          Raytel Litigation, subject to fulfilling the Raytel
          Indemnification Obligations.  The Company may substitute
          additional cash collateral for the Pledged Shares.

                    The Company also agreed to assume all of MDI's and its
          subsidiaries' obligations under employment and related agreements
          with four officers of MDI, including David Gaynor, its President.

                    The existing sublease with MDI for the premises in
          Wilmington, Massachusetts would be amended to provide that either
          party may terminate the sublease upon 60 days' written notice and
          for the payment by MDI or USD of 50% of (a) amounts payable by
          the Company to the landlord in the event of an early termination
          of the underlying lease or (b) any deficiency resulting from the
          Company's sublease of the premises at below the then current
          lease payments, up to a maximum amount of $240,000.

                    The Company and MDI also made certain other covenants
          that are customary in agreements similar to the Merger Agreement,
          including (i) restrictions on any extraordinary acts as to the
          operation of MDI during the interim period prior to the Closing,
          (ii) post-closing restrictions on competition by the Company with
          MDI for a three (3) year period, with certain exceptions and
          (iii) the general release of MDI from any claims the Company may
          have against MDI occurring at or prior to the Effective Time.

                    The Closing is conditioned upon the satisfaction of
          customary conditions including, among other things, the receipt
          of certain opinions, certificates and consents of governmental
          authorities and other third parties, including the expiration or
          termination of any notice and waiting period under the Hart-
          Scott-Rodino Antitrust Improvements Act of 1976.  The Merger has
          been authorized and approved by the Boards of Directors of the
          Company, MDI, USD and Acquisition and it has also been authorized
          and approved by the Company as the sole stockholder of MDI, but
          it is not subject to approval by the Company's stockholders.

                    The Merger Agreement would be terminated if the Closing
          does not occur on or prior to April 30, 1997.  In addition, the
          Merger Agreement may be terminated subject to the payment of a
          $1,000,000 termination fee, if MDI's or the Company's Board of
          Directors has accepted or recommended, in accordance with their
          fiduciary duties under Delaware law, an acquisition proposal from
          a third-party acquiror that is more favorable to MDI and the
          Company than the Merger from a financial point of view.  The
          Merger Agreement may also be terminated, subject to the payment
          of a $500,000 termination fee by the breaching party, as a result
          of an intentional or willful breach by either party of any
          representation, warranty or covenant made by either party or as
          the result of the breach by either party of the representations
          and warranties made by such party relating to its authority to
          enter into the Merger Agreement and the enforceability of the
          Merger Agreement against it.



          ITEM 7.   FINANCIAL STATEMENTS, PRO FORMA FINANCIAL
                    INFORMATION AND EXHIBITS.                
                    -----------------------------------------

          (c)  Exhibits


               10.       Agreement and Plan of Merger, dated January 20,
                         1997, among USD, Acquisition, the Company and MDI
                         (without exhibits or schedules).

               99.       Press Release, dated January 20, 1997, announcing
                         the execution of the Merger Agreement.


     <PAGE> 


                                      SIGNATURE


                    Pursuant to the requirements of the Securities Exchange
          Act of 1934, the Registrant has duly caused this report to be
          signed on its behalf by the undersigned thereunto duly
          authorized.


                                        ADVANCED NMR SYSTEMS, INC.
                                         /s/ Jack Nelson
                                        -----------------------------
                                        Name:   Jack Nelson
                                        Title:  Chairman

          Dated: January 22, 1997


     <PAGE> 

                                    EXHIBIT INDEX



          Exhibit
          Number              Description of Exhibit
          ------              ----------------------


          10.                 Agreement and Plan of Merger, dated January
                              20, 1997, among USD, Acquisition, the Company
                              and MDI (without exhibits or schedules).


          99.                 Press Release, dated January 20, 1997,
                              announcing the execution of the Merger
                              Agreement.



                            AGREEMENT AND PLAN OF MERGER,


                               Dated January 20, 1997,


                                        among


                                  US DIAGNOSTIC INC.
                                       ("USD"),
                                        ---- 


                             MDI ACQUISITION CORPORATION
                                   ("ACQUISITION"),
                                    ------------- 


                              MEDICAL DIAGNOSTICS, INC.
                                       ("MDI"),
                                        ----  


                                         and


                              ADVANCED NMR SYSTEMS, INC.
                                   ("STOCKHOLDER").
                                    ------------ 



   <PAGE> 


                                  TABLE OF CONTENTS
                                 --------------------
                                                                         Page
                                                                         ----

        ARTICLE I   Definitions . . . . . . . . . . . . . . . . . . . . .   1

        ARTICLE II  The Merger  . . . . . . . . . . . . . . . . . . . . .   4
             2.1    The Merger  . . . . . . . . . . . . . . . . . . . . .   4
             2.2    Closing; Effective Time of the Merger . . . . . . . .   4
             2.3    Effects of the Merger . . . . . . . . . . . . . . . .   4
             2.4    Certificate of Incorporation and Bylaws . . . . . . .   4
             2.5    Directors and Officers  . . . . . . . . . . . . . . .   4
             2.6    Effect on Capital Stock . . . . . . . . . . . . . . .   4
             2.7    Conversion of Shares  . . . . . . . . . . . . . . . .   5

        ARTICLE III    Representations and Warranties of USD  . . . . . .   5
             3.1    Organization; Authority . . . . . . . . . . . . . . .   5
             3.2    Authorization; Enforceability . . . . . . . . . . . .   5
             3.3    No Violation or Conflict  . . . . . . . . . . . . . .   6
             3.4    Consent of Governmental Authorities . . . . . . . . .   6
             3.5    Legal Proceedings . . . . . . . . . . . . . . . . . .   6
             3.6    Brokers . . . . . . . . . . . . . . . . . . . . . . .   6
             3.7    Absence of Material Adverse Changes . . . . . . . . .   6

        ARTICLE IV  Representations and Warranties of Stockholder . . . .   7
             4.1    Organization; Authority; Foreign Qualification  . . .   7
             4.2    Authorization; Enforceability . . . . . . . . . . . .   7
             4.3    No Violation or Conflict  . . . . . . . . . . . . . .   7
             4.4    Consent of Governmental Authorities . . . . . . . . .   7
             4.5    Health Care Providers . . . . . . . . . . . . . . . .   8
             4.6    Financial Statements  . . . . . . . . . . . . . . . .   8
             4.7    Compliance with Laws  . . . . . . . . . . . . . . . .   8
             4.8    Legal Proceedings . . . . . . . . . . . . . . . . . .   8
             4.9    Brokers . . . . . . . . . . . . . . . . . . . . . . .   9
             4.10   Absence of Material Adverse Changes . . . . . . . . .   9
             4.11   Transactions with Affiliates  . . . . . . . . . . . .   9
             4.12   Capitalization  . . . . . . . . . . . . . . . . . . .   9
             4.13   Rights, Warrants, Options . . . . . . . . . . . . . .  10
             4.14   Properties  . . . . . . . . . . . . . . . . . . . . .  10
             4.15   Governmental Authorizations . . . . . . . . . . . . .  11
             4.16   Insurance . . . . . . . . . . . . . . . . . . . . . .  11
             4.17   Employment Matters  . . . . . . . . . . . . . . . . .  12
             4.18   Material Agreements . . . . . . . . . . . . . . . . .  13
             4.19   List of Accounts  . . . . . . . . . . . . . . . . . .  13
             4.20   Major Customers . . . . . . . . . . . . . . . . . . .  13
             4.21   Taxes . . . . . . . . . . . . . . . . . . . . . . . .  14
             4.22   Guarantees; Powers of Attorney  . . . . . . . . . . .  14
             4.23   Environmental Matters . . . . . . . . . . . . . . . .  14
             4.24   1995 Merger Agreement . . . . . . . . . . . . . . . .  15
             4.25   Disclosure  . . . . . . . . . . . . . . . . . . . . .  15

        ARTICLE V   Covenants . . . . . . . . . . . . . . . . . . . . . .  16
             5.1    Interim Operations of MDI . . . . . . . . . . . . . .  16
             5.2    Access  . . . . . . . . . . . . . . . . . . . . . . .  17
             5.3    Confidentiality . . . . . . . . . . . . . . . . . . .  17
             5.4    Notification  . . . . . . . . . . . . . . . . . . . .  17
             5.5    Consent of Governmental Authorities and Others  . . .  18
             5.6    Acquisition Proposals; No Solicitation  . . . . . . .  18
             5.7    Best Efforts  . . . . . . . . . . . . . . . . . . . .  18
             5.8    Publicity . . . . . . . . . . . . . . . . . . . . . .  19
             5.9    Sale  or Assignment  of Interest in MVA,  MDI Rehab,
                    Middlesex and Faulkner  . . . . . . . . . . . . . . .  19
             5.10   Termination  of MDI's  Obligations  under Employment
                    Agreements  . . . . . . . . . . . . . . . . . . . . .  19
             5.11   Release of Stockholder Guarantees . . . . . . . . . .  19
             5.12   Intercompany Receivables  . . . . . . . . . . . . . .  19
             5.13   Lease Arrangements  . . . . . . . . . . . . . . . . .  19
             5.14   MMIV Escrow.  . . . . . . . . . . . . . . . . . . . .  19

        ARTICLE VI  Additional Agreements . . . . . . . . . . . . . . . .  20
             6.1    Employees and Benefit Plans . . . . . . . . . . . . .  20
             6.2    Investigation; Notices  . . . . . . . . . . . . . . .  20
             6.3    Survival   of   the   Representations,   Warranties,
                    Covenants and Agreements  . . . . . . . . . . . . . .  20
             6.4    Indemnification . . . . . . . . . . . . . . . . . . .  20
             6.5    General Release . . . . . . . . . . . . . . . . . . .  22
             6.6    Assignment  of  Rights  of  Stockholder  Under  1995
                    Acquisition Agreement . . . . . . . . . . . . . . . .  22
             6.7    Discharge of Bank Debt  . . . . . . . . . . . . . . .  22
             6.8    Blocked Account, Pledge and Security Agreement  . . .  22
             6.9    Restrictive Covenants . . . . . . . . . . . . . . . .  22
             6.10   Tax Matters . . . . . . . . . . . . . . . . . . . . .  24
             6.11   Other Indemnifications  . . . . . . . . . . . . . . .  25

        ARTICLE VII    Closing; Conditions Precedent; Termination . . . .  27
             7.1    Closing . . . . . . . . . . . . . . . . . . . . . . .  27
             7.2    Mutual Conditions Precedent . . . . . . . . . . . . .  27
             7.3    Conditions Precedent to the Obligations of USD  . . .  28
             7.4    Conditions   Precedent   to   the   Obligations   of
                    Stockholder and MDI . . . . . . . . . . . . . . . . .  29
             7.5    Termination . . . . . . . . . . . . . . . . . . . . .  30

        ARTICLE VIII   Miscellaneous  . . . . . . . . . . . . . . . . . .  30
             8.1    Notices . . . . . . . . . . . . . . . . . . . . . . .  30
             8.2    Entire Agreement  . . . . . . . . . . . . . . . . . .  31
             8.3    Assignment  . . . . . . . . . . . . . . . . . . . . .  31
             8.4    Waiver and Amendment  . . . . . . . . . . . . . . . .  31
             8.5    No Third Party Beneficiary  . . . . . . . . . . . . .  31
             8.6    Severability  . . . . . . . . . . . . . . . . . . . .  31
             8.7    Expenses; Termination Fee . . . . . . . . . . . . . .  31
             8.8    Headings  . . . . . . . . . . . . . . . . . . . . . .  32
             8.9    Counterparts  . . . . . . . . . . . . . . . . . . . .  32
             8.10   Litigation; Prevailing Party  . . . . . . . . . . . .  32
             8.11   Injunctive Relief . . . . . . . . . . . . . . . . . .  32
             8.12   Governing Law . . . . . . . . . . . . . . . . . . . .  32
             8.13   Jurisdiction and Venue  . . . . . . . . . . . . . . .  32
             8.14   Obligations of MDI  . . . . . . . . . . . . . . . . .  33

   <PAGE> 

                                      SCHEDULES
                                      ---------


                  3.4       Consent of Governmental Authorities
                  3.6       Brokers
                  4.1       Foreign Qualification
                  4.3       Material Agreements
                  4.4       Consent of Governmental Authorities
                  4.6       Financial Statements
                  4.8       Legal Proceedings
                  4.8A      Material Legal Proceedings
                  4.8B      Claims of Officers and Directors
                  4.9       Brokers
                  4.10      Absence of Material Adverse Changes
                  4.11      Transactions with Affiliates
                  4.12      Capitalization
                  4.14(a)   Real and Tangible Personal Property
                  4.14(b)   Intellectual Property Rights
                  4.15      Governmental Authorizations
                  4.16      Insurance
                  4.17(c)   Employment Agreements
                  4.17(d)   Employee Benefit Plans
                  4.18      Material Agreements
                  4.19      List of Accounts
                  4.20      Major Customers
                  4.21      Taxes
                  4.22      Guaranties; Powers of Attorney
                  4.23      Environmental Matters
                  4.24      1995 Merger Agreement
                  5.1       Pre-Closing Matters
                  5.11      Release of Stockholder Guaranties
                  6.5       General Release


                                       EXHIBITS
                                       --------


                  A         Certificate of Merger
                  B         MVA Agreement
                  C         Faulkner Agreement
                  D         Blocked Account, Pledge and Security Agreement
                  E         Opinion of Stockholder's Counsel
                  F         Auditor's Comfort Letter
                  G         Opinion of USD's Counsel


   <PAGE> 

                             AGREEMENT AND PLAN OF MERGER
                             ----------------------------


               This Agreement and Plan of Merger is entered into as of
          January 20, 1997, among ADVANCED NMR SYSTEMS, INC., a Delaware
          corporation ("Stockholder"), MEDICAL DIAGNOSTICS, INC., a         
                       ---------
          Delaware corporation which is wholly owned by Stockholder
          ("MDI"), US DIAGNOSTIC INC., a Delaware corporation ("USD"), and
            --
          MDI ACQUISITION CORPORATION, a Delaware corporation which is
          wholly-owned by USD ("Acquisition"). 
                                -----------


                                PRELIMINARY STATEMENT
                                ----------------------

               MDI is engaged in the business of owning and operating
          diagnostic imaging centers in Massachusetts, New York, Tennessee,
          West Virginia and Virginia and USD desires to acquire such
          business through the merger of Acquisition with and into MDI. 
          MDI and USD believe that the mutual best interests of MDI and USD
          and their respective shareholders will be served by the merger of
          Acquisition with and into MDI upon the terms and subject to the
          conditions of this Agreement.



                                      AGREEMENT
                                      ----------

               In consideration of the preliminary statement and the
          respective covenants, representations and warranties contained in
          this Agreement, the parties agree as set forth below.


                                      ARTICLE I

                                     DEFINITIONS
                                     ------------

             In addition to terms defined elsewhere in this Agreement, the
        following terms when used in this Agreement shall have the meanings
        indicated below:

             "Acquisition Common Stock" means the common stock of Acquisition,
              ------------------------
        par value $.01 per share.

             "Acquisition Transaction" has the meaning specified in Section
              -----------------------
        5.6 of this Agreement.

             "Affiliate" has the meaning specified in Rule 144 promulgated by
             ---------
        the Commission under the Securities Act.

             "Affiliated Group" means an affiliated group as defined in
              ---------------
        Section 1504 of the Code (or any analogous combined, consolidated or
        unitary group defined under state, local or foreign income Tax law) of
        which MDI or any of its Subsidiaries is or has been a member.

             "Agreement" means this Agreement and Plan of Merger together with
              --------
        all exhibits and schedules referred to herein.

             "Assumed Employees" has the meaning specified in Section 5.10 of
              -----------------                               -----------
        this Agreement.

             "Assumed Employee Claims" has the meaning specified in Section
              ----------------------                                -------
        6.11 of this Agreement.
        ----

             "Basket Limitation" has the meaning specified in Section 6.4 of
              -----------------                              ------------
        this Agreement.

             "Cap Limitation" has the meaning specified in Section 6.4 of this
              --------------                               -----------
        Agreement.

             "Certificate of Merger" has the meaning set forth in Section 2.2
              ---------------------                               -----------
        of this Agreement.

             "Chase" has the meaning set forth in Section 2.6 of this
              -----                               -----------
        Agreement.

             "Closing" has the meaning specified in Section 2.2 of this
              -------                               -----------
        Agreement.

             "Closing Date" has the meaning specified in Section 2.2 of this
              ------------                               -----------
        Agreement.

             "Code" means the Internal Revenue Code of 1986, as amended.
              ----

             "Commission" means the Securities and Exchange Commission.
              ----------

             "Covenant Period" has the meaning specified in Section 6.9 of
              ---------------                               -----------
        this Agreement.

             "Delaware GCL" means the General Corporation Law of the State of
              ------------
        Delaware.

             "Effective Time" shall have the meaning set forth in Section 2.2
              --------------                                      -----------
        of this Agreement.


             "Environmental Laws" has the meaning specified in Section 4.23 of
              ------------------                               ------------
        this Agreement.

             "Environmental Permits" has the meaning specified in Section 4.23
              ---------------------                               -----------
        of this Agreement.

             "ERISA" has the meaning specified in Section 4.17 of this
              -----                               ------------
        Agreement.

             "Exchange Act" means the Securities Exchange Act of 1934, as
              ------------
        amended, and the rules and regulations promulgated thereunder.

              "Faulkner" has the meaning set forth in Section 5.9 of this
              --------                               -----------
        Agreement.

             "Financial Statements" means MDI's audited consolidated balance
              --------------------
        sheet and the related audited consolidated statements of operations,
        stockholders' equity and cash flow as at and for the year ended
        September 30, 1996.

             "Guaranty" means, as to any Person, any contract, agreement or
              --------
        understanding of such Person pursuant to which such Person guarantees
        the indebtedness, liabilities or obligations of others, directly or
        indirectly, in any manner, including agreements to purchase such
        indebtedness, liabilities or obligations, or to supply funds to or in
        any manner invest in others, or to otherwise assure the holder of such
        indebtedness, liabilities or obligations against loss.

             "Hazardous Substances" has the meaning specified in Section 4.23
              --------------------                               -------------
        of this Agreement.

             "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements Act
              -------
        of 1976, as amended, and the rules and regulations promulgated
        thereunder.

             "Knowledge" or "known" means, with respect to any representation
              ---------      -----
        or warranty or other statement in this Agreement qualified by the
        knowledge of any party, that such party has made a diligent
        investigation as to the matters that are the subject of such
        representation, warranty or other statement.  Where reference is made
        to the knowledge of Stockholder, MDI or USD, such reference shall mean
        the actual knowledge of the executive officers of Stockholder, MDI or
        USD, as the case may be, all having conducted the diligent
        investigation contemplated by this definition.

             "Licenses" has the meaning specified in Section 4.15 of this
              --------                              -----------
        Agreement. 

             "Losses" has the meaning specified in Section 6.4 of this
              ------                               -----------
        Agreement.

             "Lynch Litigation" has the meaning specified in Section 6.11 of
              ----------------                               -----------
        this Agreement.

             "Material Agreements" has the meaning specified in Section 4.18
              -------------------                              ------------
        of this Agreement.

             "MDI Common Stock" means the common stock of MDI, par value $.01
              ----------------
        per share.

             "MDI Intellectual Property" has the meaning specified in Section
              -------------------------                              --------
         4.14(b) of this Agreement.
         ------

             "MDI Plans" has the meaning specified in Section 4.17 of this
              ---------                               ------------
        Agreement.

             "MDI Rehab" has the meaning specified in Section 5.9 of this
              ---------                               -----------
        Agreement.

             "Merger" has the meaning specified in Article II of this
              -------
        Agreement.

             "Merger Consideration" has the meaning set forth in Section 2.6
              --------------------                               -----------
        of this Agreement.

             "Middlesex" has the meaning specified in Section 5.9 of this
              ---------                               -----------
        Agreement.

             "MMIV" has the meaning specified in Section 6.11 of this
              ----                               ------------
        Agreement.

             "MVA" has the meaning set forth in Section 5.9 of this Agreement.
              ---                               -----------

             "Pension Plan" has the meaning specified in Section 4.17 of this
              ------------                               ------------
        Agreement.

             "Person" means any natural person, corporation, unincorporated
              ------
        organization, partnership, association, joint stock company, joint
        venture, trust or government, or any agency or political subdivision
        of any government, or any other entity.

             "Raytel" means Raytel Corporation, Raytel Medical Corporation and
              -----
        their respective Affiliates.


             "Raytel Litigation" has the meaning specified in Section 6.11 of
              -----------------                               ------------
        this Agreement.

             "Securities Act" means the Securities Act of 1933, as amended,
              --------------
        and the rules and regulations promulgated thereunder.

             "Subsidiary" of any Person means any Person, whether or not
              ---------
        capitalized, in which such Person owns, directly or indirectly, an
        equity interest of 50% or more, or any Person which may be controlled,
        directly or indirectly, by such Person, whether through the ownership
        of voting securities, by contract, or otherwise.

             "Surviving Corporation" has the meaning set forth in Section 2.1
              ----------------------                              -----------
        of this Agreement.

             "Symbols" has the meaning set forth in Section 6.9 of this
              ------                                -----------
        Agreement.

             "Tax Returns" means returns, declarations, reports, claims for
              -----------
        refund, information returns or other documents (including any related
        or supporting schedules, statements or information) filed or required
        to be filed in connection with the determination, assessment or
        collection of any Taxes of any party or the administration of any
        laws, regulations or administrative requirements relating to any
        Taxes.

             "Taxes" has the meaning specified in Section 4.21 of this
              -----                               -------------
        Agreement.

             "Termination Date" has the meaning specified in Section 7.5 of
              ----------------                               -----------
        this Agreement.

             "Welfare Plan" has the meaning specified in Section 4.17 of this
              ------------                               -------------
        Agreement.

                                      ARTICLE II

                                      THE MERGER
                                      ----------

             2.1  THE MERGER.  Upon the terms and subject to the conditions
                  ----------
        set forth in this Agreement, and in accordance with the Delaware GCL,
        at the Effective Time, Acquisition shall be merged (the "Merger") with
                                                                ------
        and into MDI.  At the Effective Time, the separate corporate existence
        of Acquisition shall cease, and MDI shall continue as the surviving
        corporation of the Merger under the laws of the State of Delaware (the
        "Surviving Corporation") under its present name.  The corporate
        ---------------------
        existence of USD and of Stockholder shall not be affected by the
        Merger.

             2.2  CLOSING; EFFECTIVE TIME OF THE MERGER.  Unless this
                  -------------------------------------
        Agreement is terminated in accordance with its terms, the consummation
        of the transactions contemplated by this Agreement (the "Closing")
                                                                -------
        shall take place at the offices of USD as soon as practicable, and in
        any event within three days, after the satisfaction or waiver of the
        conditions precedent to the obligations of the parties set forth in
        Article VII (the "Closing Date"), or on such other date and at such
                          ------------
        other place as may be agreed to by the parties.  On the Closing Date,
        the parties hereto shall cause the Merger to be consummated by filing
        a certificate of merger, substantially in the form set forth as
        Exhibit A (the "Certificate of Merger"), with the Secretary of State
        ---------       ---------------------
        of the State of Delaware, in such form as required by, and executed in
        accordance with the relevant provisions of, the Delaware GCL (the date
        and time of the filing of the Certificate of Merger with the Secretary
        of State of the State of Delaware (or such later time as is specified
        in the Certificate of Merger) being the "Effective Time").  
                                                -------------- 


             2.3  EFFECTS OF THE MERGER.  From and after the Effective Time,
                  ---------------------
        the Merger shall have the effects set forth under the applicable
        provisions of the Delaware GCL.

             2.4  CERTIFICATE OF INCORPORATION AND BYLAWS.
                  ---------------------------------------

                  (a)  CERTIFICATE OF INCORPORATION.  At the Effective Time,
                       ----------------------------
        and until thereafter amended or repealed in accordance with their
        terms and as provided by law, the Certificate of Incorporation of the
        Surviving Corporation shall be the Certificate of Incorporation of
        MDI, as in effect immediately prior to the Effective Time.

                  (b)  BYLAWS.  At the Effective Time, the Bylaws of the
                       ------
        Surviving Corporation shall be the Bylaws of MDI, as in effect
        immediately prior to the Effective Time, until thereafter amended or
        repealed in accordance with their terms and the Certificate of
        Incorporation of the Surviving Corporation and as provided by law.  

             2.5  DIRECTORS AND OFFICERS.  The directors of Acquisition
                  ----------------------
        immediately prior to the Effective Time shall be the directors of the
        Surviving Corporation, each to hold office in accordance with the
        Certificate of Incorporation and Bylaws of the Surviving Corporation,
        and the officers of Acquisition immediately prior to the Effective
        Time shall be the officers of the Surviving Corporation, in each case
        until their respective successors are duly elected or appointed, as
        the case may be, and qualified.

             2.6  EFFECT ON CAPITAL STOCK.  At the Effective Time, by virtue
                  -----------------------
        of the Merger and without any action on the part of the holders of
        shares of MDI Common Stock or any shares of capital stock of
        Acquisition:

                  (a)  COMMON STOCK OF ACQUISITION.  Each share of Acquisition
                       ---------------------------
        Common Stock issued and outstanding immediately prior to the Effective
        Time shall be converted into one share of validly issued, fully paid
        and nonassessable common stock of the Surviving Corporation, which
        shall be all of the issued and outstanding capital stock of the
        Surviving Corporation as of the Effective Time.

                  (b)  CONVERSION OF MDI COMMON STOCK.  All of the outstanding
                       ------------------------------
        shares of MDI Common Stock shall be converted at the Effective Time
        into the right of the record holder thereof to receive cash from USD
        in an aggregate amount equal to Twenty-Two Million Dollars
        ($22,000,000) (the "Merger Consideration"); and the Merger
                      --------------------
        Consideration shall be paid at the Effective Time as follows:  (i) USD
        shall deliver, by wire transfer, to Chase Manhattan Bank N.A.
        ("Chase"), on behalf of Stockholder and MDI, an amount sufficient to
          -----
        fully satisfy all of MDI's and its Subsidiaries' obligations to Chase;
        and (ii) USD shall deliver, by wire transfer, to the record holder of
        the MDI Common Stock at the Effective Time the remainder of the Merger
        Consideration.  Subject to the terms set forth above in this Section
                                                                     -------
         2.6(b), each issued and outstanding share of MDI Common Stock shall
        -------
        be converted at the Effective Time into the right to receive from USD
        a number of dollars equal to a fraction, the numerator of which is
        equal to the Merger Consideration (less amounts paid to Chase), and
        the denominator of which is equal to the number of issued and
        outstanding shares of MDI Common Stock at the Effective Time, all
        payable as set forth above in this Section 2.6(b).
                                           --------------


                  (c)  CANCELLATION AND RETIREMENT OF MDI COMMON STOCK.  As of
                       -----------------------------------------------
        the Effective Time, each issued and outstanding share of MDI Common
        Stock shall automatically be cancelled and retired and shall cease to
        exist, and the sole holder of certificate(s) representing any such
        shares of MDI Common Stock shall cease to have any rights with respect
        thereto, except the right to receive the Merger Consideration upon
        surrender of such certificate(s) in accordance with Section 2.7.
                                                         -----------

             2.7  CONVERSION OF SHARES.
                  --------------------

                  (a)  CONVERSION PROCEDURES.  At the Effective Time, the sole
                       ---------------------
        holder of outstanding certificate(s) which prior thereto represented
        shares of MDI Common Stock shall, upon surrender to USD of such
        certificate(s), be entitled to the amount of cash specified in Section
                                                                       -------
        2.6.
        ----

                  (b)  NO FURTHER OWNERSHIP RIGHTS IN MDI COMMON STOCK.  The
                       ------------------------------------------------
        Merger Consideration paid upon the surrender of certificate(s)
        representing shares of MDI Common Stock in accordance with the terms
        of this Article II shall constitute full satisfaction of all rights
        pertaining to the shares of MDI Common Stock theretofore represented
        by such certificates.


                                     ARTICLE III

                        REPRESENTATIONS AND WARRANTIES OF USD
                        -------------------------------------

             In order to induce Stockholder to enter into this Agreement and
        to consummate the transactions contemplated hereby, USD makes the
        representations and warranties set forth below to Stockholder.

             3.1  ORGANIZATION; AUTHORITY.  Each of USD and Acquisition is a
                  -----------------------
        corporation duly organized, validly existing and in good standing
        under the laws of its state of incorporation.  USD has the corporate
        authority to: (A) own or lease and operate its properties; and (B)
        conduct its business as presently conducted.  Each of USD and
        Acquisition has the corporate power and authority to execute, deliver
        and perform this Agreement.

             3.2  AUTHORIZATION; ENFORCEABILITY.  The execution, delivery and
                  -----------------------------
        performance of this Agreement by USD and Acquisition and the
        consummation by USD and Acquisition of the transactions contemplated
        hereby have been duly authorized by all requisite corporate action. 
        The execution, delivery and performance of this Agreement by USD does
        not require the approval of USD's stockholders.  This Agreement has
        been duly executed and delivered by USD and Acquisition and
        constitutes the legal, valid and binding obligation of USD and
        Acquisition, enforceable against them in accordance with its terms,
        except to the extent that its enforcement is limited by bankruptcy,
        insolvency, reorganization or other laws relating to or affecting the
        enforcement of creditors' rights generally and by general principles
        of equity.

             3.3  NO VIOLATION OR CONFLICT.  The execution, delivery and
                  ------------------------
        performance by USD and Acquisition of this Agreement and the
        consummation by USD and Acquisition of the transactions contemplated
        hereby: (A) do not and will not violate or conflict with any provision
        of law or any regulation, or any writ, order, judgment or decree of
        any court or governmental or regulatory authority specifically naming
        USD, any of its Subsidiaries or Acquisition (other than where such
        occurrence would not prohibit USD from consummating the transactions
        contemplated hereby on or prior to the Termination Date), or any
        provision of USD's or Acquisition's Certificate of Incorporation or
        Bylaws; and (B) do not and will not, with or without the passage of
        time or the giving of notice, result in the breach of, or constitute a
        default, cause the acceleration of performance, or require any
        consent, authorization or approval under, or result in the creation of
        any lien, charge or encumbrance upon any property or assets of USD or
        Acquisition pursuant to any instrument or agreement to which USD or
        Acquisition is a party or any of their assets are bound (other than
        where such occurrence would not prohibit USD from consummating the
        transactions contemplated hereby on or prior to the Termination Date).

             3.4  CONSENT OF GOVERNMENTAL AUTHORITIES.  Except as set forth on
                  ----------------------------------
        Schedule 3.4 and other than in connection with the HSR Act, the
        ------------
        Exchange Act, any applicable state securities laws, and the filing
        and/or recordation of the Certificate of Merger under the Delaware
        GCL, no consent, approval or authorization of, or registration,
        qualification or filing with any federal, state, local or foreign
        governmental or regulatory authority is required to be made by USD or
        Acquisition in connection with the execution, delivery or performance
        by USD or Acquisition of this Agreement or the consummation by USD or
        Acquisition of the transactions contemplated hereby, except where the
        failure to obtain such consent, approval or authorization or to make
        such registration, qualification or filing would not prevent USD from
        consummating the transactions contemplated hereby on or prior to the
        Termination Date.  USD knows of no reason why any of the consents,
        approvals or authorizations set forth in this Section 3.4 or on
                                           -----------
        Schedule 3.4 would not be granted.
        ------------

             3.5  LEGAL PROCEEDINGS.  Neither USD nor any of its Subsidiaries
                  -----------------
        is a party to any pending or, to the knowledge of USD, threatened,
        legal, administrative or other proceeding, arbitration or
        investigation, that would hinder USD in consummating the transactions
        contemplated hereby on or prior to the Termination Date.  To USD's
        knowledge, neither USD nor any of its Subsidiaries is subject to any
        order, injunction or other judgment of any court or governmental
        authority that would hinder USD in consummating the transactions
        contemplated hereby on or prior to the Termination Date.

             3.6  BROKERS.  Except as set forth on Schedule 3.6, USD has not
                  -------                          ------------
        employed any financial advisor, broker or finder and has not incurred
        and will not incur any broker's, finder's, investment banking or
        similar fees, commissions or expenses, in connection with the
        transactions contemplated by this Agreement.

             3.7  ABSENCE OF MATERIAL ADVERSE CHANGES.  Since December 31,
                  -----------------------------------
        1995, there has been no material adverse change or material
        deterioration in the financial condition, results of operations,
        assets, liabilities or business of USD and its Subsidiaries on a
        consolidated basis that would hinder USD in consummating the
        transactions contemplated hereby on or prior to the Termination Date.


                                      ARTICLE IV

                    REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER
                     --------------------------------------------


             In order to induce USD and Acquisition to enter into this
        Agreement and to consummate the transactions contemplated hereby,
        Stockholder makes the representations and warranties set forth below
        to USD and Acquisition.

             4.1  ORGANIZATION; AUTHORITY; FOREIGN QUALIFICATION.  Each of
                  ----------------------------------------------
        Stockholder, MDI and MDI's Subsidiaries is a corporation duly
        organized, validly existing and in good standing under the laws of its
        jurisdiction of incorporation.  Each of MDI and its Subsidiaries is
        duly qualified to transact business as a foreign corporation in all
        jurisdictions where the ownership or leasing of its properties or the
        conduct of its business requires such qualification.  Each
        jurisdiction in which MDI or any of its Subsidiaries is qualified to
        transact business as a foreign corporation is listed on Schedule 4.1. 

                                            -----------
        Other than those jurisdictions listed on Schedule 4.1 hereto, there
                                      ------------
        are no jurisdictions in which any of MDI or any of its Subsidiaries
        own or lease property (real or personal), has offices or employees or
        maintains inventory.  Each of MDI and its Subsidiaries has the
        corporate authority to: (A) own or lease and operate its properties;
        and (B) conduct its business as presently conducted.  Each of
        Stockholder and MDI has the corporate power and authority to execute,
        deliver and perform this Agreement.

             4.2  AUTHORIZATION; ENFORCEABILITY.  The execution, delivery and
                  -----------------------------
        performance of this Agreement by Stockholder and MDI and the
        consummation by them of the transactions contemplated hereby have been
        duly authorized by all requisite corporate action.  The execution,
        delivery and performance of this Agreement by Stockholder and MDI and
        the consummation by them of the transactions contemplated hereby does
        not require the approval of Stockholder's stockholders.  This
        Agreement has been duly executed and delivered by Stockholder and MDI,
        and constitutes the legal, valid and binding obligation of Stockholder
        and MDI, enforceable against them in accordance with its terms, except
        to the extent that its enforcement is limited by bankruptcy,
        insolvency, reorganization or other laws relating to or affecting the
        enforcement of creditors' rights generally and by general principles
        of equity.

             4.3  NO VIOLATION OR CONFLICT.  The execution, delivery and
                  ------------------------
        performance by Stockholder and MDI of this Agreement and the
        consummation by Stockholder and MDI of the transactions contemplated
        hereby: (A) do not and will not violate or conflict with any provision
        of law or regulation, or any writ, order, judgment or decree of any
        court or governmental or regulatory authority specifically naming
        Stockholder or MDI or any of their respective Subsidiaries, or any
        provision of Stockholder's or MDI's Certificate of Incorporation or
        Bylaws; and (B) do not and will not, with or without the passage of
        time or the giving of notice, result in the breach of, or constitute a
        default, cause the acceleration of performance, or require any
        consent, authorization or approval under, or result in the creation of
        any lien, charge or encumbrance upon any property or assets of
        Stockholder or MDI or any of MDI's Subsidiaries pursuant to any
        Material Agreement, except for consents required under Material
        Agreements listed on Schedule 4.3, all of which shall have been
                            ------------
        obtained by Stockholder on or prior to the Closing Date without any
        significant cost or adverse effect.

             4.4  CONSENT OF GOVERNMENTAL AUTHORITIES.  Except as set forth on
                  -----------------------------------
        Schedule 4.4 hereto and except in connection with the HSR Act, the
        ------------
        Exchange Act, any applicable state securities laws, and the filing
        and/or recordation of the Certificate of Merger under the Delaware
        GCL, no consent, approval or authorization of, or registration,
        qualification or filing with any federal, state or local governmental
        or regulatory authority is required to be made by Stockholder or MDI
        in connection with the execution, delivery or performance by
        Stockholder and MDI of this Agreement or the consummation by them of
        the transactions contemplated hereby, except where the failure to
        obtain such consent, approval or authorization or to make such
        registration, qualification or filing would not have a material
        adverse effect on the financial condition, results of operations,
        assets, liabilities or business of MDI and its Subsidiaries or
        materially hinder MDI or Stockholder in consummating the transactions
        contemplated hereby on or prior to the Termination Date.  Neither
        Stockholder nor MDI knows of any reason any of the consents, approvals
        or authorizations set forth in this Section 4.4 or Schedule 4.4 would
                                           -----------    ------------
        not be granted.

             4.5  HEALTH CARE PROVIDERS.  All physicians, technologists and
                  ---------------------
        other personnel retained or employed by MDI or its Subsidiaries
        maintain in good standing all staff memberships, licenses, credentials
        and other similar affiliations necessary or desirable for their
        current provision of services on behalf of MDI and its Subsidiaries.

             4.6  FINANCIAL STATEMENTS.  The Financial Statements, as of the
                  --------------------
        date thereof and for the period covered thereby, present fairly, in
        all material respects, the financial position, results of operations,
        and cash flows of MDI and its Subsidiaries.  Except as otherwise noted
        in Schedule 4.6, the Financial Statements were prepared in conformity
           ------------
        with generally accepted accounting principles applied on a consistent
        basis.  The Financial Statements and supporting schedules were audited
        by independent public accountants within the meaning of the rules
        promulgated by the Commission.  Other than as disclosed by the
        Financial Statements or on Schedule 4.18 hereto, neither MDI nor any
                                  -------------
        of its Subsidiaries has any liabilities, commitments or obligations
        (which could be material to any of them on a consolidated basis) of
        any nature whatsoever, whether accrued, contingent or otherwise (other
        than nonmaterial liabilities, commitments or obligations incurred
        since September 30, 1996 in the ordinary course of business consistent
        with past practices to Persons other than Affiliates of Stockholder)
        nor any unrealized or anticipated losses which could be material to
        MDI on a consolidated basis from any commitments of MDI or any of its
        Subsidiaries, and, to Stockholder's and MDI's knowledge, there is no
        reasonable basis for assertion against MDI or any of its Subsidiaries
        of any liability, commitment or loss.  MDI's accounts receivable, as
        set forth in the Financial Statements, arose in the ordinary course of
        business, constitute valid and undisputed claims which are not subject
        to any counterclaims or offsets and have been collected or are
        collectible at their recorded amounts, net of any reserves for
        doubtful accounts in accordance with past practices and generally
        accepted accounting principles applied on a consistent basis, subject
        to contractual reimbursement allowances in accordance with past
        practices and generally accepted accounting principles applied on a
        consistent basis.  MDI's billing practices are in compliance with all
        applicable laws.

             4.7  COMPLIANCE WITH LAWS.  MDI and its Subsidiaries (and the
                  --------------------
        properties used by them) are in compliance with all federal, state,
        local and foreign laws, ordinances, regulations, judgments, rulings,
        orders and other legal requirements applicable to them, their
        properties or their operations, and neither MDI nor any of its
        Subsidiaries (nor any of the properties used by any of them) is
        relying on any exemption or deferral therefrom.  Stockholder has
        furnished USD with true and correct copies of all correspondence from
        governmental authorities asserting that MDI or any of its Subsidiaries
        is not or was not in compliance with any laws, ordinances,
        regulations, judgments, rulings, orders or other requirements.  All
        deficiencies noted in any such report furnished to USD in accordance
        with this Section 4.7 have been corrected.
                  -----------


             4.8  LEGAL PROCEEDINGS.  Except as set forth in Schedule 4.8,
                  -----------------                           ------------ 
        neither MDI nor any of its Subsidiaries is a party to any pending or,
        to the knowledge of Stockholder and MDI, threatened, legal,
        administrative or other proceeding, arbitration or investigation. 
        Except for items set forth in Schedule 4.8A, none of the proceedings,
                                      -------------
        arbitrations or investigations set forth in Schedule 4.8, could have a
                                                    ------------
        material adverse effect on the financial condition, results of
        operations, assets, liabilities, prospects or business of MDI and its
        Subsidiaries on a consolidated basis or hinder Stockholder or MDI in
        consummating the transactions contemplated hereby on or prior to the
        Termination Date, and there is no valid basis for any such proceeding,
        arbitration or investigation.  MDI is not subject to any order,
        injunction or other judgment of any court or governmental authority. 
        Except as otherwise set forth in Schedule 4.8B hereto, no director or
                                        -------------
        officer of MDI or any of its Subsidiaries has, since December 31,
        1994, made any claim against MDI or any of its Subsidiaries for
        indemnification or advancement of expenses or claims under any
        director and officer liability insurance policy in connection with any
        threatened, pending or completed action, suit or proceeding in which
        any such director or officer is or was a party or threatened to be
        made a party, whether civil, criminal, administrative or investigative
        and, to the knowledge of Stockholder and MDI, no reasonable basis for
        assertion against MDI or any of its Subsidiaries or against any
        insurance company issuing any such director and officer liability
        insurance policy exists.

             4.9  BROKERS.  Except as set forth on Schedule 4.9, neither

                  -------                          ------------
        Stockholder nor MDI has employed any financial advisor, broker or
        finder and neither has incurred and neither will incur any broker's,
        finder's, investment banking or similar fees, commissions or expenses
        to any other party in connection with the transactions contemplated by
        this Agreement.

             4.10 ABSENCE OF MATERIAL ADVERSE CHANGES.  Except as set forth in
                  -----------------------------------
        Schedule 4.10, since September 30, 1996: (A) each of MDI and its
        -------------
        Subsidiaries has conducted its businesses in the ordinary and usual
        course; (B) there has been no material adverse change or material
        deterioration in the financial condition, results of operations,
        assets, liabilities, prospects or business of MDI and its Subsidiaries
        on a consolidated basis; and (C) neither MDI nor any of its
        Subsidiaries has engaged or agreed to engage in any of the actions
        described in Section 5.1 (A) through (L), (N), (Q) and (R) or in any
                  ---------------------------------------------
        of the actions described in the next-to-last sentence of Section 5.1. 
                                                                 -----------
        The outstanding principal balance of revolving loans and term loans
        under MDI's credit facility is the maximum currently permitted
        thereunder, and no principal payment thereunder has been made since
        September 30, 1996.

             4.11 TRANSACTIONS WITH AFFILIATES.  Except as set forth in
                  ----------------------------
        Schedule 4.11, there are no, and since September 30, 1996 there have
        -------------
        been no, contracts, agreements or arrangements of any kind (including,
        but not limited to those relating to, the sharing of overhead,
        intercompany loans, the furnishing of services and the lease of
        facilities) between any Affiliate of MDI, on the one hand, and MDI or
        any of its Subsidiaries, on the other hand, including, but not limited
        to, any loans or advances by MDI or any of its Subsidiaries to MVA,
        MDI Rehab or Middlesex.  Without limiting the generality of the
        foregoing, except as set forth on Schedule 4.11, (i) no Affiliate of
                                           -------------
        MDI has any interest in any property (real or personal, tangible or
        intangible, or otherwise) used in MDI's business, (ii) MDI and its
        Subsidiaries have no indebtedness to Stockholder or any of its other
        Affiliates and (iii) MDI and its Subsidiaries are not owed any
        indebtedness by Stockholder or any of its other Affiliates.  Except as
        set forth on Schedule 4.11, all items required to be set forth thereon
                     -------------
        are on arms'-length terms.

             4.12 CAPITALIZATION.  As of the date hereof, the authorized
                  --------------
        capital stock of MDI consists of 1,000 shares of MDI Common Stock, of
        which 100 shares are issued and outstanding.  All of the issued and
        outstanding shares of MDI Common Stock are owned beneficially and of
        record by Stockholder, free and clear of any and all liens, claims,
        charges, security interests, voting agreements or encumbrances of any
        nature whatsoever.  MDI has no treasury shares.  All shares of MDI's
        and each of its Subsidiaries' outstanding capital stock have been duly
        authorized, are validly issued and outstanding, and are fully paid and
        nonassessable.  No securities issued by MDI or any of its Subsidiaries
        from the date of its incorporation to the date hereof were issued in
        violation of any statutory, contractual or common law preemptive
        rights.  There are no dividends or distributions which have accrued or
        been declared but are unpaid on the capital stock of MDI or any of its
        Subsidiaries.  Except as set forth on Schedule 4.12, neither MDI nor
                                              -------------
        any of its Subsidiaries has declared or paid any dividends or
        distributions since December 31, 1994.  All taxes (including
        documentary stamp taxes) required to be paid in connection with the
        issuance by MDI or any of its Subsidiaries of MDI's and each of its
        Subsidiaries' capital stock have been paid.  All authorizations
        required to be obtained from or registrations required to be effected
        with any Person in connection with the issuances of securities by MDI
        and each of its Subsidiaries from their respective dates of
        incorporation to the date hereof have been obtained or effected and
        all securities of MDI and its Subsidiaries have been issued in
        accordance with the provisions of all applicable securities and other
        laws.  All of the outstanding securities of each of MDI's Subsidiaries
        are owned by either MDI or another of its Subsidiaries, free and clear
        of all liens, charges, claims or encumbrances except as set forth on
        Schedule 4.12.  Schedule 4.12 lists all Subsidiaries of MDI, their
        -------------   --------------
        jurisdictions of incorporation or organization, the number of shares
        of their respective capital stock or other equity interests issued and
        outstanding.  Except as set forth in Schedule 4.12, neither MDI nor
                                             --------------
        any of its Subsidiaries has any equity investment in any other
        corporation, association, partnership, joint venture or other entity. 
        MDI Rehab's sole asset is its interest in MVA.  Middlesex has no
        assets.

             4.13 RIGHTS, WARRANTS, OPTIONS.  There are no outstanding: (A)
                  -------------------------
        securities or instruments convertible into or exercisable for any of
        the capital stock or other equity interests of MDI or any of its
        Subsidiaries issued by MDI or any of its Subsidiaries or to which
        Stockholder or MDI or any of its Subsidiaries is a party; (B) options,
        warrants, subscriptions or other rights to acquire capital stock or
        other equity interests of MDI or any of its Subsidiaries issued by
        Stockholder or MDI or any of its Subsidiaries; or (C) commitments,
        agreements or understandings of any kind to which Stockholder or MDI
        or any of its Subsidiaries is a party, including employee benefit
        arrangements, relating to the issuance or repurchase by MDI or any of
        its Subsidiaries of any capital stock or other equity interests of MDI
        or any of its Subsidiaries, any such securities or instruments
        convertible into or exercisable for capital stock or other equity
        interests of MDI or any such options, warrants or rights.  Each of the
        terms referenced in the foregoing sentence is hereinafter referred to
        as "Options".
             -------

             4.14 PROPERTIES.
                  ---------- 

                  (a)  REAL AND TANGIBLE PERSONAL PROPERTY.   Except as set
                       -----------------------------------
        forth on Schedule 4.14(a), MDI or its Subsidiaries has valid title to
              -----------------
        all properties, interests in properties and assets (real and personal)
        reflected in the consolidated balance sheet of MDI as at September 30,
        1996 (except properties, interests in properties and assets sold or
        otherwise disposed of since September 30, 1996 in the ordinary course
        of business to Persons other than Affiliates of MDI consistent with
        past practices), free and clear of all mortgages, liens, pledges,
        charges or encumbrances of any kind or character, except the lien of
        current taxes not yet due and payable.  Schedule 4.14(a) hereof lists
                                               ----------------
        each piece of real property owned, leased or utilized by MDI and/or
        its Subsidiaries, including the location thereof and the use to which
        it is put by MDI and/or any of its Subsidiaries.  All improvements
        located on any real property owned by MDI or any of its Subsidiaries
        are in good structural condition, free from any termite infestation or
        damage, roof leakage, wood rot or decay or any structural or other
        defect or impairment of any nature whatsoever which might impair the
        value, utility or life expectancy of such improvements, or which might
        otherwise adversely affect the operation thereof.  All of the real
        property owned by MDI or any of its Subsidiaries and the improvements
        thereon are suitable for the purposes for which they are currently
        used.  All of the real property owned by MDI or any of its
        Subsidiaries has all utilities required for the full and complete
        occupancy and operation thereof.  There exist paved and publicly
        dedicated roads providing pedestrian and vehicular ingress and egress
        to and from all of such real property and no additional easements or
        licenses are required for such access.  To the best of Stockholder's
        and MDI's knowledge, no fact or condition exists which could result in
        the termination or impairment of any access to any of the real
        property owned by MDI or any of its Subsidiaries, or which could
        result in a discontinuation of necessary water, sewer, telephone, gas,
        electric or other utilities or services to any of such real property. 
        To the best of Stockholder's and MDI's knowledge, none of the
        improvements located on any of the real property owned by MDI or any
        of its Subsidiaries encroach onto adjoining land or onto any
        easements, and there is no encroachment of improvements from adjoining
        land onto any of such real property.  To the best of Stockholder's and
        MDI's knowledge, none of the real property owned by MDI or any of its
        Subsidiaries is located in an area identified as having special flood
        or mud slide hazards or wet lands.  To the best of Stockholder's and
        MDI's knowledge, there are no soil or geological conditions which
        might impair or adversely affect the current use of any of the real
        property owned by MDI or any of its Subsidiaries.  No written
        notification has been received by Stockholder or MDI advising that the
        whole or any portion of the real property owned by MDI is being
        condemned or otherwise taken by any public authority.  Except as set
        forth on Schedule 4.14(a), the facilities, equipment and assets
                 --------------
        utilized by MDI and/or its Subsidiaries and/or necessary to the
        operations of MDI's and/or its Subsidiaries' businesses are owned or
        leased by MDI and/or its Subsidiaries and are not obsolete, and are in
        good operating condition and repair sufficient for the operation of
        the business as presently conducted.  Each of the leases under which
        the properties of MDI and its Subsidiaries are leased is unmodified
        and in full force and effect and there are no agreements between
        Stockholder, MDI or any of their respective Subsidiaries and any third
        parties claiming an interest in MDI's or its Subsidiaries' interest in
        the leased property occupied by MDI or its Subsidiaries or otherwise
        affecting its use and occupancy thereof.  Neither MDI nor any of its
        Subsidiaries is in default under any of such leases and no defaults
        (whether or not subsequently cured) by MDI or its Subsidiaries have
        been alleged thereunder.  To the best of MDI's and Stockholder's
        knowledge, each lessor named in any of such leases is not in default
        thereunder, and no defaults by such lessor have been alleged
        thereunder and are continuing.  Schedule 4.14(a) also sets forth, with
                                        ----------------
        respect to each lease (capitalized or otherwise) to which MDI or any
        of its Subsidiaries is a party which is a Material Agreement: (A) the
        parties to such lease; (B) the property covered by such lease; (C) a
        schedule of payments payable under such lease (both throughout the
        term of the lease and at the end of the lease); (D) whether MDI or any
        of its Subsidiaries has any rights or obligations to acquire any
        property which is subject to such lease and the price and terms
        thereof; (E) the term of such lease; and (F) any options which MDI or
        any of its Subsidiaries may have to extend the term of such lease. 
        Set forth on Schedule 4.14(a) is a list of the five largest lessors of
                    -----------------
        equipment (measured by dollar volume) to MDI and its Subsidiaries
        during the fiscal year ended September 30, 1996, and with respect to
        each, the name and address and the dollar volume involved.  The
        amortization of each capitalized lease is based on the useful life of
        the asset.

                  (b)  INTELLECTUAL PROPERTY RIGHTS.  MDI or one of its
                       -----------------------------
        Subsidiaries owns, or is licensed or otherwise entitled to use, all
        patents, trademarks, trade names, service marks, copyrights and
        applications for any of the foregoing, together with all other
        technology, know-how, tangible or intangible proprietary information
        or material and formulae in the countries to which such apply, that
        are material to the business of MDI and its Subsidiaries as currently
        conducted (the "MDI Intellectual Property"), all of which are set
                  -------------------------
        forth on Schedule 4.14(b).  Except as disclosed on Schedule 4.14(b)
                ----------------                          -----------------
        hereto, no claims have been asserted in writing to MDI or any of its
        Subsidiaries or, to the knowledge of Stockholder or MDI, otherwise
        asserted or threatened, by any Person: (A) to the effect that the MDI
        Intellectual Property infringes on any intellectual property rights of
        any other Person; (B) against the use by MDI or any of its
        Subsidiaries of any of the MDI Intellectual Property; or (C)
        challenging or questioning the validity or effectiveness of any of the
        MDI Intellectual Property.  All registered trademarks and copyrights
        listed on Schedule 4.14(b) are valid and subsisting.  
                  ----------------

             4.15 GOVERNMENTAL AUTHORIZATIONS.  MDI and its Subsidiaries have
                  ---------------------------
        in full force and effect all authorizations, consents, approvals,
        franchises, licenses and permits required under applicable law or
        regulation (collectively referred to as "Licenses") for the ownership
                                               ---------
        of MDI's and its Subsidiaries' properties and operation of their
        businesses as presently operated.  Except as set forth on Schedule
                                                                  --------
        4.15, the execution, delivery and performance by Stockholder and MDI
        -----
        of this Agreement and the consummation by them of the transactions
        contemplated hereby do not and will not have an adverse effect on any
        of MDI's Licenses or require any consent or approval of, or any filing
        with or notice to any governmental authority with respect to any
        License.

             4.16 INSURANCE.  Schedule 4.16 sets forth a list and description
                  ---------   -------------
        of all insurance policies existing as of the date hereof providing
        insurance coverage of any nature to MDI or any of its Subsidiaries. 
        Furthermore: (A) none of MDI or any of its Subsidiaries is in default
        under any such policies and there is no inaccuracy in any application
        for any such policies; (B) each of MDI and its Subsidiaries'
        activities and operations have been conducted in a manner so as to
        conform in all material respects to the applicable provisions of such
        policies; (C) all premiums and other charges under each such policy
        shall have been paid through the Closing Date and none of Stockholder,
        MDI nor any of their respective Subsidiaries has received written
        notice of cancellation or non-renewal with respect to any such policy;
        and (D) timely notice has been given of any and all claims under all
        such policies.  Schedule 4.16 also lists all risks for which MDI and
                  -------------
        its Subsidiaries are self-insured.  MDI and its Subsidiaries have not,
        during the past two years, been refused insurance coverage by any
        company, nor have any of them had insurance coverage offered to them
        at unreasonably high premiums or with limited coverage.


             4.17 EMPLOYMENT MATTERS. 
                  ------------------

                  (a)  LABOR UNIONS.  None of the employees of MDI or any of
                       ------------
        its Subsidiaries is represented by any labor union, and neither MDI
        nor any of its Subsidiaries is subject to any labor or collective
        bargaining agreement.  None of the employees of MDI or any of its
        Subsidiaries is known by Stockholder or MDI to be engaged in
        organizing any labor union or other employee group that is seeking
        recognition as a bargaining unit.  Neither MDI nor any of its
        Subsidiaries has had any strikes, work stoppages, slow downs, lockouts
        or claims of unfair labor practices for the past three years, and to
        the best knowledge of the Stockholder and MDI, there exist no facts
        which could reasonably be expected to lead thereto.

                  (b)  EMPLOYMENT POLICIES.  MDI has provided to USD all
                       -------------------
        written employee policies, employee manuals or other written
        statements of rules or policies concerning employment applicable to
        the employees of MDI and/or its Subsidiaries.

                  (c)  EMPLOYMENT AGREEMENTS.  Except as set forth on Schedule
                       ---------------------                         --------
        4.17(c), there are no employment, consulting, severance or
        -------
        indemnification arrangements, agreements, or understandings between
        MDI or any of its Subsidiaries and any officer, director, consultant
        or employee.

                  (d)  EMPLOYEE BENEFIT PLANS.  Schedule 4.17(d) sets forth a
                       -----------------------  ----------------
        complete list of all pension, retirement, stock purchase, stock bonus,
        stock ownership, stock option, profit sharing, savings, medical,
        disability, hospitalization, insurance, deferred compensation, bonus,
        incentive, welfare or any other employee benefit plan, policy,
        agreement, commitment, arrangement or practice currently or previously
        maintained by Stockholder, MDI or any of MDI's Subsidiaries for any of
        directors, officers, consultants, employees or former employees of MDI
        or any of its Subsidiaries (the "MDI Plans").  Schedule 4.17(d) also
                                         ---------     ----------------
        identifies each MDI Plan which constitutes an "employee pension
        benefit plan" ("Pension Plan") or an "employee welfare benefit plan"
                        -----------
        ("Welfare Plan"), as such terms are defined in the Employee Retirement
         --------------
        Income Security Act of 1974, as amended ("ERISA").  None of the MDI
                                                  -----
        Plans is a "multiemployer plan," as such term is defined in ERISA, or
        is subject to Title IV of ERISA.  Either MDI or a Subsidiary has
        delivered or made available to USD true and complete copies of the
        following for each MDI Plan, if applicable:  (i) the Plan document;
        (ii) summary plan description of the MDI Plan; (iii) the trust
        agreement, insurance policy or other instrument relating to the
        funding of the MDI Plan; (iv) the most recent Annual Report (Form 5500
        series) and accompanying schedules filed with the IRS or Department of
        Labor with respect to the MDI Plan; (v) the most recent audited
        financial statement for the MDI Plan; and (vi) the most recent
        determination letter issued by the IRS with respect that to the MDI
        Plan that is intended to qualify under Section 401(a) of the Code.

             Each Pension Plan has been determined by the IRS to be qualified
        under Section 401(a) of the Code, and each such plan remains so

              --------------
        qualified; and to Stockholder's and MDI's knowledge, no facts or
        circumstances exist which could result in the revocation of such
        qualification.  Each Welfare Plan which is intended to meet the
        requirements for tax-favored treatment under the Code to Stockholder's
        and MDI's knowledge meets such requirements.  Without limiting the
        generality of Section 4.7, each MDI Plan has been administered in
                      -----------
        accordance with its terms and the Code, and each Pension Plan and
        Welfare Plan has been administered in all material respects in
        accordance with ERISA.  No facts or circumstances exist which might
        give rise to any liability of any of MDI Plan, USD, MDI, any
        Subsidiary or Acquisition to any other Person.  Stockholder and MDI
        have paid all amounts required under applicable law, any Pension Plan
        and any Welfare Plan to be paid as a contribution to each Pension Plan
        and Welfare Plan through the date hereof.  MDI has set aside adequate
        reserves to meet contributions which are not yet due under any Pension
        Plan or Welfare Plan.  Neither MDI nor any of its Subsidiaries, nor
        any other Person has engaged in any transaction or taken any other
        action with respect to any MDI Plan which would subject MDI, any
        Subsidiary, USD or Acquisition to: (A) any tax, penalty or liability
        for prohibited transactions under ERISA or the Code; (B) any tax under
        Code Sections 4971, 4972, 4976, 4977 or 4979; or (C) a penalty under
        ERISA Sections 502(c) or 502(l).  None of Stockholder, MDI or any of
        their respective Subsidiaries, to the extent it is a fiduciary with
        respect to any Pension Plan or Welfare Plan, has breached any of its
        responsibilities or obligations imposed upon fiduciaries under ERISA
        or the Code or which could result in any claim being made under, by or
        on behalf of any Pension Plan or Welfare Plan or any participant or
        beneficiary thereof other than benefit claims in the ordinary course,
        in any such event which could give rise to liability to MDI or any of
        its Subsidiaries.  Each Welfare Plan which is a group health plan
        within the meaning of Code Section 5000(b)(1) complies with and in
        each and every case has complied with the applicable requirements of
        Code Section 4980B and Part 6 of Title I of ERISA.  Except as set
        forth in Schedule 4.17(d), no MDI Plan, other than an MDI Plan which
                 -----------------
        is an employee pension benefit plan (within the meaning of Section
        3(2)(A) of ERISA), provides benefits, including without limitation,
        death, health or medical benefits (whether or not insured), with
        respect to current or former employees of MDI and any of its
        Subsidiaries beyond their retirement or other termination of service
        with any of MDI and any of its Subsidiaries, other than coverage
        mandated by applicable law.

             4.18 MATERIAL AGREEMENTS.  Schedule 4.18 sets forth a list of all
                        -------------------   -------------
        written and oral agreements, leases (whether capitalized or
        otherwise), arrangements or commitments to which either MDI or any of
        its Subsidiaries is a party or by which it or any of the assets it
        owns, leases or utilizes is bound which are expected to result in the
        receipt or payment of $20,000 or more by MDI or any of its
        Subsidiaries or which are material to the financial position, results
        of operations or prospects of MDI and its Subsidiaries on a
        consolidated basis or to the ability of MDI to consummate the
        transactions contemplated hereby (the "Material Agreements").  MDI has
                                               -------------------
        furnished USD with true and complete copies of all Material
        Agreements.  The Material Agreements are each in full force and effect
        and are the valid and legally binding obligations of MDI or the
        applicable Subsidiary which is a party to same and, to Stockholder's
        and MDI's knowledge, are valid and binding obligations of the 
        Certificate of Incorporation or Bylaws or in default under any
        Material Agreement to which it is a party, and no event has occurred
        which with the giving of notice or lapse of time or both would
        constitute such a default.  Except as set forth on Schedule 4.18,
                                                           -------------
        neither MDI nor any of its Subsidiaries: (A) has any agreement,
        contract or commitment which requires the making of any charitable
        contributions; (B) has any agreement, contract or commitment which is
        not terminable without penalty, liability or premium upon notice of 30
        days or less; (C) has any agreement, contract or commitment containing
        any severance, termination or similar provisions; (D) has any
        outstanding obligation for borrowed money; (E) has any outstanding
        loan or advance to any Person; (F) has any power of attorney
        outstanding; (G) has any agreement, contract or commitment relating to
        joint ventures, partnerships or debt or equity investments; (H) has
        any agreements, contracts or commitments relating to non-competition
        or, non-disclosure, non-solicitation or other similar restrictive
        covenants; (I) has any agreements, contracts or commitments relating
        to the registration of any of MDI's securities; (J) has any agreement,
        contract or commitment relating to the voting or other rights with
        respect to any securities of MDI or any of its Subsidiaries; and (K)
        has any contract, commitment or arrangement with any hospital,
        hospital management company, health maintenance organization,
        insurance company, third party payor or managed care provider or
        company.

             4.19 LIST OF ACCOUNTS.  Schedule 4.19 sets forth, as of the date
                  ----------------   -------------
        hereof: (A) the name and address of each bank or other institution in
        which MDI or any of its Subsidiaries maintains an account (cash,
        securities or other) or safe deposit box; (B) the name and phone
        number of MDI's contact person at such bank or institution; (C) the
        account number of the relevant account and a description of the type
        of account; and (D) the persons authorized to transact business in
        such accounts.

             4.20 MAJOR CUSTOMERS.  Set forth on Schedule 4.20 is a list of
                  --------------                -------------
        the 10 largest customers (measured by dollar volume) of each of MDI
        and each of its Subsidiaries for the year ended September 30, 1996,
        and with respect to each, the name and address, dollar volume involved
        and nature of the relationship.  None of such customers of MDI and its
        Subsidiaries has: (A) modified in any material respect, cancelled,
        suspended or otherwise terminated its relationship with MDI or any of
        its Subsidiaries; or (B) advised MDI or any of its Subsidiaries of its
        intention to modify in any material respect, cancel, suspend or
        terminate its relationship with MDI or any of its Subsidiaries, to
        significantly decrease its purchase of services from MDI or any of its
        Subsidiaries, to change the nature of its business relationship with
        MDI or any of its Subsidiaries or to adversely change the terms upon
        which it purchases services from MDI or any of its Subsidiaries.

             4.21 TAXES.  Except as set forth in Schedule 4.21: (A) there have
                  -----                          -------------
        been timely filed (or shall timely be filed prior to the Effective
        Time) all Tax Returns with respect to MDI and its Subsidiaries
        required to be filed with any taxing authority with respect to Taxes
        for any period ending on or before the Effective Time, taking into
        account any extension of time to file granted to or obtained on behalf
        of MDI and its Subsidiaries; (B) all Taxes shown to be payable on such
        returns or reports that are due prior to the Effective Time have been
        paid or shall be paid (prior to the Effective Time), and all such
        returns or reports accurately reflect the proper amount of Taxes
        payable for the applicable periods; (C) no deficiency for any Tax has
        been asserted or assessed by a taxing authority against or with
        respect to MDI or any of its Subsidiaries; (D) MDI and each of its
        Subsidiaries have provided adequate reserves in their Financial
        Statements for any Taxes that have not been paid, whether or not shown
        as being due on any returns; (E) the income tax returns of MDI have
        never been audited; and (F) MDI has not waived any restrictions on
        assessment or collection of Taxes or consented to the extension of any
        statute of limitations relating to Taxes.  As used in this Agreement,
        "Taxes" shall mean any and all taxes, fees, levies, duties, tariffs,
         -----
        imposts and other charges of any kind (together with any and all
        interest, penalties, additions to tax and additional amounts imposed
        with respect thereto) imposed by any government or taxing authority,
        including, without limitation: taxes or other charges on or with
        respect to income, franchises, windfall or other profits, gross
        receipts, property, sales, use, capital stock, payroll, employment,
        social security, workers  compensation, unemployment compensation or
        net worth; taxes or other charges in the nature of excise,
        withholding, ad valorem, stamp, transfer, value-added or gains taxes;
        license, registration and documentation fees; and customers  duties,
        tariffs and similar charges.

             4.22 GUARANTEES; POWERS OF ATTORNEY.  Except as set forth on
                  ------------------------------
        Schedule 4.22 hereto, neither MDI nor any of its Subsidiaries is a
        -------------
        party to any Guaranty, and none of them has executed any power of
        attorney or similar agreement.

             4.23 ENVIRONMENTAL MATTERS.
                  ---------------------

                  (a)  DEFINITIONS.  For purposes of this Agreement, the
                       -----------
        following terms shall have the following meanings: (A) "Hazardous
                                                                ----------
        Substances" means:  (i) those substances defined in or regulated under
        ----------
        the following federal statutes and their state counterparts, as each
        may be amended from time to time, and all regulations thereunder: the
        Hazardous Materials Transportation Act, the Resource Conservation and
        Recovery Act, the Comprehensive Environmental Response, Compensation
        and Liability Act, the Clean Water Act, the Safe Drinking Water Act,
        the Atomic Energy Act, the Federal Insecticide, Fungicide, and
        Rodenticide Act, the Toxic Substances Control Act and the Clean Air
        Act; (ii) petroleum and petroleum products, byproducts and breakdown
        products including crude oil and any fractions thereof; (iii) natural
        gas, synthetic gas, and any mixtures thereof; (iv) polychlorinated
        biphenyls; (v) any other chemicals, materials or substances defined or
        regulated as toxic or hazardous or as a pollutant or contaminant or as
        a waste under any applicable Environmental Law; and (vi) any substance
        with respect to which a federal, state or local agency requires
        environmental investigation, monitoring, reporting or remediation; and
        (B) "Environmental Laws" means any federal, state, foreign, or local
             -------------------
        law, rule or regulation, now or hereafter in effect and as amended,
        and any judicial or administrative interpretation thereof, including
        any judicial or administrative order, consent decree or judgment,
        relating to pollution or protection of the environment, health, safety
        or natural resources, including, without limitation, those relating to
        (i) releases or threatened releases of Hazardous Substances or
        materials containing Hazardous Substances or (ii) the manufacture,
        handling, transport, use, treatment, storage or disposal of Hazardous
        Substances or materials containing Hazardous Substances.

                  (b)  ENVIRONMENTAL STATUS.  Except as described in Schedule
                       --------------------                          --------
        4.23 hereto: (A) MDI and each of its Subsidiaries are and have been in
        ----
        compliance with all applicable Environmental Laws; (B) MDI and each of
        its Subsidiaries have obtained all permits, approvals, identification
        numbers, licenses or other authorizations required under any
        applicable Environmental Laws ("Environmental Permits") and are and
                                        ---------------------
        have been in compliance with their requirements; (C) such
        Environmental Permits do not, in connection with the Merger, require
        the consent or approval of, or any filing with or notice to, any
        governmental authority; (D) there are no underground or aboveground
        storage tanks or any surface impoundments, septic tanks, pits, sumps
        or lagoons in which Hazardous Substances are being or have been
        treated, stored or disposed of on any owned or leased real property or
        on any real property formerly owned, leased or occupied by MDI or any
        of its Subsidiaries; (E) there is no asbestos or asbestos-containing
        material on any owned or leased real property in violation of
        applicable Environmental Laws; (F) MDI and its Subsidiaries have not
        released, discharged or disposed of Hazardous Substances at any real
        property owned by any third party except in compliance with
        Environmental Laws or any real property owned or leased or on any real
        property formerly owned or leased by MDI or any of its subsidiaries
        and none of such property is contaminated with any Hazardous
        Substances; (G) neither MDI nor any of its subsidiaries is
        undertaking, and neither MDI nor any of its Subsidiaries has
        completed, any investigation or assessment or remedial or response
        action relating to any such release, discharge or disposal of or
        contamination with Hazardous Substances at any site, location or
        operation, either voluntarily or pursuant to the order of any
        governmental authority or the requirements of any Environmental Law;
        and (H) there are no past or pending or, to the knowledge of the
        Stockholder or MDI, threatened actions, suits, demands, demand
        letters, claims, liens, notices of non-compliance or violation,
        notices of liability or potential liability, investigations,
        proceedings, consent orders or consent agreements relating in any way
        to Environmental Laws, any Environmental Permits or any Hazardous
        Substances against MDI or any of its Subsidiaries or any of their
        property which are outstanding or have been outstanding during the
        past two years, and there are no circumstances that could be expected
        to form the basis for any of the foregoing.  MDI and its Subsidiaries
        have made available to USD copies of any environmental reports,
        studies or analyses in its possession relating to owned or leased real
        property or the operations of MDI or its Subsidiaries.

             4.24 1995 MERGER AGREEMENT.  Without limiting the generality of
                  ---------------------
        any representation, warranty, covenant or agreement set forth herein
        or made in connection herewith, except as set forth on Schedule 4.24,
                                                               -------------
        Stockholder and MDI do not have knowledge that any of the
        representations, warranties, covenants and agreements of any party set
        forth in the Agreement and Plan of Merger, dated May 2, 1995, among
        Stockholder, MDI and ANMR Acquisition Corp. (the "1995 Merger
        Agreement") were not true and correct in all respects as of the date
        thereof.  Stockholder and MDI do not have knowledge that any party to
        such Agreement has violated, or will violate as a result of the
        execution, delivery and performance of this Agreement, any term,
        provision or agreement set forth in the 1995 Merger Agreement or any
        agreement executed in connection therewith.  This Section 4.24 does
                                                          ------------
        not waive or affect any rights or remedies that Stockholder has or may
        have against any Person under the 1995 Merger Agreement.  All
        consideration payable to Persons who were stockholders of record of
        MDI immediately prior to the closing of the 1995 Merger Agreement has
        been fully paid, and no dissenters' or appraisal rights were asserted
        in connection with such transaction.

             4.25 DISCLOSURE.  No representation or warranty of Stockholder
                  ----------
        contained in this Agreement or the Schedules hereto, and no
        certificate or notice furnished by or on behalf of Stockholder or MDI
        to USD or its agents pursuant to this Agreement, contains or will
        contain any untrue statement of a material fact or omits to state a
        material fact necessary in order to make the statements contained
        herein or therein not misleading.


                                      ARTICLE V

                                      COVENANTS
                                      ----------

             During the period from the date of this Agreement to the Closing
        Date, Stockholder agrees to cause MDI to perform all of MDI's
        covenants and agreements in this Article V and USD and Acquisition
        agree to perform all of their covenants and agreements in this
        Article V, all as follows:

             5.1  INTERIM OPERATIONS OF MDI.  MDI shall operate its business
                  -------------------------
        only in the ordinary and usual course consistent with past practices
        and shall use its best efforts to preserve intact its business
        organization and the goodwill of its customers, suppliers, employees
        and others having business relations with it and to continuously
        maintain insurance coverage substantially equivalent to the insurance
        coverage in existence on the date hereof.  In addition, without
        limiting the foregoing, except as may be contemplated in, or disclosed
        in Schedule 5.1 or any other schedule to, this Agreement without the
           ------------
        written consent of USD, which shall not be unreasonably withheld, MDI
        and each of its Subsidiaries shall not: (A) amend its Articles or
        Certificate of Incorporation or Bylaws; (B) issue, sell or authorize
        for issuance or sale, shares of any class of its securities
        (including, but not limited to, by way of stock split or dividend) or
        any subscriptions, options, warrants, rights or convertible
        securities, or enter into any agreements or commitments of any
        character obligating it to issue or sell any such securities; (C)
        redeem, purchase or otherwise acquire, directly or indirectly, any
        shares of its capital stock or any option, warrant or other right to
        purchase or acquire any such shares; (D) declare or pay any dividend
        or other distribution (whether in cash, stock or other property) with
        respect to its capital stock; (E) voluntarily sell, transfer,
        surrender, abandon or dispose of any of its assets or property rights
        (tangible or intangible), other than non-material dispositions in the
        ordinary course of business consistent with past practices, which
        could not have a material adverse effect on the financial condition,
        results of operations, assets, prospects, liabilities or business of
        MDI and its Subsidiaries on a consolidated basis; (F) grant or make
        any mortgage or pledge or subject itself or any of its properties or
        assets to any lien, charge or encumbrance of any kind, except liens
        for taxes not currently due or liens not exceeding $50,000 in the
        aggregate; (G) create, incur or assume any liability or any
        indebtedness, except in the ordinary course of business consistent
        with past practices, but in no event in an aggregate amount exceeding
        $50,000 more than is shown on MDI's September 30, 1996 Financial
        Statements or cancel any debts or waive any claims or rights in an
        aggregate amount in excess of $50,000; (H) make or commit to make any
        capital expenditures in excess of $50,000 in the aggregate; (I) grant
        any increase in the compensation payable or to become payable to
        directors, officers or employees (including, without limitation, any
        such increase pursuant to any MDI Plan or otherwise), other than merit
        increases to officers and employees in the ordinary course of business
        and consistent with past practices, but in no event to exceed $50,000
        in the aggregate, or pay or satisfy any obligations for deferred
        salary, accrued vacation or other deferred or accrued amounts to
        Assumed Employees; (J) enter into any agreement, arrangement or
        commitment that, if it existed on the date hereof, would be a Material
        Agreement, or amend or terminate any of same or any existing Material
        Agreement, or enter into, terminate or modify any contract, agreement
        or arrangement with Stockholder or any Affiliate thereof (except to
        the extent expressly contemplated hereby); (K) alter the manner of
        keeping its books, accounts or records, or change in any manner the
        accounting practices (including, but not limited to, those relating to
        amortization and depreciation) therein reflected; (L) enter into any
        commitment or transaction other than in the ordinary course of
        business consistent with past practices; (M) take or omit to take any
        action which would render any of its representations or warranties
        untrue or misleading or which would be a breach of any of its
        covenants; (N) write off the value of any inventory or accounts
        receivable or increase the reserve for uncollectible receivables or
        obsolete, damaged or otherwise unsalable inventory, except as required
        by generally accepted accounting principles consistently applied or by
        law, or discount, factor, sell or otherwise transfer any account
        receivable; (O) approve any increase in the benefits payable under, or
        establish any new MDI Plan; (P) take any action which could have a
        material adverse effect on the financial condition, results of
        operations, assets, liabilities, properties, prospects or business of
        MDI or any of its Subsidiaries, or on employee, customer or supplier
        relations or hinder MDI in consummating the transactions contemplated
        hereby on or prior to the Termination Date, or reduce or downsize its
        operations, reduce its work force or eliminate any operations; (Q)
        make any Guaranty; (R) apply any of its assets to the direct or
        indirect payment, discharge, satisfaction or reduction of any amount
        payable directly or indirectly (i) to or for the benefit of any
        Affiliate of MDI or any of its Subsidiaries (except for salary and
        benefits as currently in effect and except in accordance with existing
        agreements and arrangements which have been disclosed to USD by MDI in
        writing) or (ii) to any Person, except in the ordinary course of
        business consistent with past practices; or (S) agree, whether in
        writing or otherwise, to do any of the foregoing.  Without limiting
        the generality of the foregoing, Stockholder shall not permit MDI or
        any of its Subsidiaries, directly or indirectly, (i) to incur any
        expenses or obligations in connection with the acquisition of any
        interest in MVA owned by any third party (except for using the
        $200,000 advanced by Stockholder to pay a portion of the purchase
        price), (ii) to loan or otherwise advance any money to, or make any
        investment in, MDI Rehab, Middlesex or MVA or otherwise become liable
        for any obligations of MDI Rehab, Middlesex or MVA or (iii) to incur
        any expenses or obligations with respect to MDI Rehab, Middlesex, MVA
        or Faulkner; and Stockholder and MDI shall not permit any payment of
        principal to Chase prior to the Closing.  Stockholder shall not take
        or omit to take any action which would render any of its
        representatives or warranties herein untrue or misleading or which
        would be a breach of any of its covenants herein.

             5.2  ACCESS.  MDI shall: (A) afford to USD and its agents and
                  ------
        representatives reasonable access to the properties, books, records
        and other information of MDI and its Subsidiaries, provided that such
        access shall be granted upon reasonable notice and at reasonable times
        during normal business hours; (B) use its reasonable efforts to cause
        MDI's personnel to assist USD in its investigation of MDI and its
        Subsidiaries pursuant to this Section 5.2; and (C) furnish promptly to
                                      -----------
        USD all information and documents concerning its business, assets,
        liabilities, properties and personnel as USD may from time to time
        reasonably request.  In addition, from the date of this Agreement
        until the Closing Date, MDI shall cause one or more of its officers to
        confer on a regular basis with officers of USD and to report on the
        general status of its ongoing operations.

             5.3  CONFIDENTIALITY.  Except as otherwise required by law or in
                  ---------------
        the performance of obligations under this Agreement, any nonpublic
        information received by a party or its advisors, agents or
        representatives from the other party shall be kept confidential and
        shall not be used or disclosed for any purpose other than in
        furtherance of the transactions contemplated by this Agreement.  The
        obligation of confidentiality shall not extend to information which:
        (A) is or becomes generally available to the public other than as a
        result of a disclosure by a party in violation of this Agreement; (B)
        was in the lawful possession of a party prior to its receipt from the
        other party; or (C) becomes available to a party on a nonconfidential
        basis from a source other than a party to this Agreement, provided
        such source is not known to be in violation of a confidentiality
        agreement.  Upon termination of this Agreement, each party shall, upon
        request, promptly return or destroy any confidential information
        received from the other party.  The covenants of the parties contained
        in this Section 5.3 shall survive any termination of this Agreement
                -----------
        but shall terminate at the Closing, if it occurs, with respect to
        information concerning MDI and its Subsidiaries.

             5.4  NOTIFICATION.  Stockholder and USD shall promptly notify the
                  ------------
        other in writing of the occurrence, or threatened occurrence, of: (A)
        any event that would constitute a breach of this Agreement by such
        party or any of its Subsidiaries or could be expected to have a
        material adverse effect on MDI's or USD's (or any of its
        Subsidiaries'), as the case may be, financial condition, results of
        operations, assets, liabilities, prospects or business or on its
        ability to consummate the transactions contemplated hereby on or prior
        to the Termination Date; (B) any event that would cause any
        representation or warranty made by such party in this Agreement to be
        false or misleading in any respect; (C) any other matter which occurs
        after the date of this Agreement which, if existing on the date of
        this Agreement, would have been required to be disclosed herein;
        provided, however, that the delivery of any notice under this Section
        --------  -------                                             -------
        5.4 shall not cure any breach of any provision set forth in this
        --
        Agreement or otherwise limit or affect the remedies available to the
        party receiving such notice; (D) any notice from any governmental or
        regulatory authority relating to the transactions contemplated hereby;
        and (E) any notice or communication from any Person suggesting that
        any notice, consent, filing or similar item is necessary to consummate
        the transactions contemplated hereby.  MDI will provide to USD true
        and complete copies of all reports or notices to and other
        communications with any governmental or regulatory authority relating
        to MDI between the date of this Agreement and the Closing Date.

             5.5  CONSENT OF GOVERNMENTAL AUTHORITIES AND OTHERS.  Each of USD
                  ----------------------------------------------
        and Stockholder or MDI agrees to file, submit or request promptly
        after the date of this Agreement and to prosecute diligently any and
        all consents, approvals, authorizations, registrations,
        qualifications, filings, applications and notices appropriate for
        filing or submission to any governmental authorities, as provided in
        Sections 3.4 and 4.4.  Each of USD, MDI and Stockholder agrees to
        --------------------
        file, submit or request promptly after the date of this Agreement and
        to prosecute diligently any and all consents, approvals,
        authorizations, registrations, qualifications, filings, applications
        and notices appropriate for filing or submission to any Person which
        are required for, or otherwise in furtherance of, the consummation of
        transactions contemplated hereby.  Each of USD, MDI and Stockholder
        shall promptly make available to the other such information as each of
        them may reasonably request relating to its business, assets,
        liabilities, properties and personnel as may be required by each of
        them to prepare and file or submit such applications and notices and
        any additional information requested by any governmental authority,
        and shall update by amendment or supplement any such information given
        in writing.  Each of USD, MDI and Stockholder represents and warrants
        to the other that such information, as amended or supplemented, shall
        be true, correct and complete and not misleading.

             5.6  ACQUISITION PROPOSALS; NO SOLICITATION.  Stockholder shall
                  --------------------------------------
        not, nor will it permit MDI or any of their respective directors,
        officers, employees or agents to, directly or indirectly: (A) solicit,
        initiate, encourage or participate in any negotiations or discussions
        with respect to any offer or proposal to, directly or indirectly,
        acquire all or a substantial portion of the business or properties, or
        any of the capital stock or securities, of MDI or any of its
        Subsidiaries, whether by merger (other than the Merger),
        consolidation, share exchange, business combination, purchase of
        assets, lease of assets, exchange of assets, pledge of assets, other
        disposition of assets or otherwise (an "Acquisition Transaction"); or
        (B) except as required by law, disclose to any Person, other than USD
        or its agents, any information not customarily disclosed concerning
        the business, assets, liabilities, properties and personnel of MDI, or
        afford to any Person other than USD and its agents access to the
        properties, books or records of MDI; except that as to both (A) and
        (B) above, Stockholder and MDI may, following written notice to USD as
        provided below, furnish information and access, in each case in
        response to bona fide unsolicited requests therefor, but only to the
        extent required by the fiduciary duties of the board of directors of
        Stockholder or MDI imposed by Delaware law (as determined in good
        faith by its respective Board of Directors based upon advice of
        outside counsel), as the case may be, to any Person pursuant to
        appropriate confidentiality agreements, and may participate in
        discussions and negotiate with such Person in connection with any
        Acquisition Transaction if the Board of Directors of Stockholder or
        MDI determines in its good faith judgment that such action is
        appropriate in furtherance of the best interests of MDI.  In addition,
        Stockholder and MDI shall direct its officers and other appropriate
        personnel to cooperate with any such Person.  If Stockholder or MDI
        receives any offer or proposal, written or otherwise, of the type
        referred to above, Stockholder shall promptly inform USD of such offer
        or proposal and furnish USD with a copy thereof if such offer or
        proposal is in writing.

             5.7  BEST EFFORTS.  Subject to the terms and conditions of this
                  ------------
        Agreement, each of Stockholder, MDI and USD shall use its best efforts
        in good faith to take or cause to be taken as promptly as practicable
        all reasonable actions that are within its control to cause to be
        fulfilled: (A) those conditions precedent to its obligations to
        consummate the Merger; and (B) those actions upon which the conditions
        precedent to the other party's obligations to consummate the Merger
        are dependent.  Without limiting the generality of the foregoing, the
        parties shall in good faith vigorously defend any action seeking to
        enjoin, prohibit or materially restrict the Merger.

             5.8  PUBLICITY.  Stockholder and USD agree to cooperate in
                  ---------
        issuing any press release or other public announcement (including any
        filings made with the Commission) concerning this Agreement or the
        transactions contemplated hereby.  Nothing contained herein shall
        prevent any party from at any time furnishing any information to any
        governmental authority which it is by law or otherwise so obligated to
        disclose or from making any disclosure which its counsel deems
        necessary or advisable in order to fulfill such party's disclosure
        obligations under applicable law or the rules of NASDAQ.

             5.9  SALE OR ASSIGNMENT OF INTEREST IN MVA, MDI REHAB, MIDDLESEX
                  -----------------------------------------------------------
        AND FAULKNER.  Immediately prior to the Effective Time, MDI shall sell

        ------------
        or assign its interest in MDI Rehab, Inc. ("MDI Rehab"), which owns a
                                                    --------
        75% interest in MVA Rehabilitation Associates ("MVA"), in Middlesex
                                                        ---
        MRI Center, Inc. ("Middlesex"), and in any leases or other agreements
                          ---------
        or instruments with or relating to Faulkner Hospital Sagoff Woman's
        Center ("Faulkner"), including the exemption letter allowing for the
        operation of the facility, and cause MDI and its Subsidiaries to be
        released from any obligations relating to MVA, MDI Rehab, Middlesex
        and/or Faulkner, pursuant to the terms of the Agreements attached
        hereto as Exhibits B and C. 
                  ----------     -

             5.10 TERMINATION OF MDI'S OBLIGATIONS UNDER EMPLOYMENT
                  -------------------------------------------------
        AGREEMENTS.  Immediately prior to the Effective Time, Stockholder
        ----------
        shall assume all of MDI's and its Subsidiaries' obligations under
        MDI's employment and related agreements with David Gaynor, Steven
        James, Ruselle Robinson and Elaine McCarthy (the "Assumed Employees").
                                                          -----------------

             5.11 RELEASE OF STOCKHOLDER GUARANTEES.  The Stockholder is the
                  ---------------------------------
        guarantor of the obligations of MDI or its Subsidiaries listed on
        Schedule 5.11.  USD shall cooperate with the Stockholder and MDI in
        -------------
        obtaining the release of the Stockholder from such guarantees,
        including USD making available such information as is reasonably
        requested, regarding the business and financial condition of USD, and
        also, where requested, USD shall provide a substitute guarantee.

             5.12 INTERCOMPANY RECEIVABLES.  At the Effective Time, (i) all
                  ------------------------
        obligations of Stockholder and its Subsidiaries (except MDI and its
        Subsidiaries) and MVA and MDI Rehab and Middlesex to MDI and its
        Subsidiaries shall be satisfied in accordance with their terms and
        (ii) all obligations of MDI to Stockholder for advances made to MDI
        and its Subsidiaries which are set forth on Schedule 5.1 as to be
                                                    ------------
        satisfied at the Closing shall be satisfied in accordance with their
        terms. 

             5.13 LEASE ARRANGEMENTS.  At the Closing, the parties shall amend
                  ------------------
        the existing Sublease between MDI and Stockholder so that either party
        may terminate such Sublease upon 60 days' prior written notice,
        without cost or liability for such termination.  At the Closing, the
        parties shall also enter into an agreement pursuant to which, in the
        event that Stockholder (i) agrees with its landlord to terminate its
        lease for the premises which are the subject of such Sublease and
        vacate such premises prior to the expiration of such lease, MDI would
        pay 50% of any amounts payable to Stockholder's landlord as a result
        of such early termination or (ii) subleases all or a portion of such
        premises for less than the current lease payments with respect to such
        subleased premises, MDI would pay 50% of such deficiency; provided,
                                                                  --------
        however, that the aggregate cost to MDI under this Section 5.13 shall
        -------
        not exceed $240,000.

             5.14 MMIV ESCROW.  Immediately prior to the Effective Time, the
                  -----------
        beneficiary on the MDI Escrow Account at Fleet Bank (#9375408388) will
        be changed from MDI and Western Massachusetts Magnetic Resonance
        Services, Inc. to Stockholder.



                                      ARTICLE VI

                                ADDITIONAL AGREEMENTS
                                ----------------------


             6.1  EMPLOYEES AND BENEFIT PLANS.  Upon consummation of the
                  ---------------------------
        Merger, USD shall permit employees of MDI and its Subsidiaries to
        participate in each of USD's employee benefit plans and stock option
        plans and with credit for prior service, subject to the eligibility
        requirements and other terms and conditions of such plans.  USD shall
        not be required to continue the employment of any employees of MDI and
        its Subsidiaries, but, to the extent USD desires to terminate the
        employment of any of such employees, it shall be solely responsible
        for effecting such termination and the consequences thereof, and
        nothing set forth herein shall be deemed an employment agreement.  

             6.2  INVESTIGATION; NOTICES.  The representations, warranties and
                  ----------------------
        covenants set forth in this Agreement shall not be affected or
        diminished in any way by the receipt of any notice pursuant to Section
                                                                      --------
        5.4 or by any investigation (or failure to investigate) at any time by
        ---
        or on behalf of the party for whose benefit such representations,
        warranties and covenants were made.  All statements contained in this
        Agreement or any Schedule hereto, or in any certificate or notice
        delivered pursuant hereto shall be deemed to be representations and
        warranties for purposes of this Agreement.

             6.3  SURVIVAL OF THE REPRESENTATIONS, WARRANTIES, COVENANTS AND
                  -----------------------------------------------------------
        AGREEMENTS.  All representations, warranties, covenants and 
        ----------
        agreements of USD, Stockholder and MDI contained in this Agreement
        shall survive the Closing until the date which is 18 months after the
        Closing Date, except for the representations, warranties, covenants
        and agreements of Stockholder (a) contained in Sections 3.2, 4.2,
                                                       ------------------
        4.12, 4.13, 6.5, 6.8 and 6.11 which shall survive the Closing Date
        -----------------------------
        without limitation as to time, (b) relating to taxes of any kind or to
        tax related matters, which shall survive the Closing Date until the
        date which is thirty (30) days after the date the applicable statute
        of limitations for the payment, collection or assessment of any such
        tax has expired and (c) contained in Section 6.9 which shall survive
                                             -----------
        the Closing for three years.

             6.4  INDEMNIFICATION.
                  ---------------

                  6.4.1     Subject to the limitations set forth in Section
                                                                    -------
        6.4.4 hereof, Stockholder agrees to indemnify and hold harmless USD
        -----
        and its assigns from, against and in respect of, the full amount of
        any and all liabilities, damages, claims, deficiencies, settlements,
        fines, assessments, losses, taxes, penalties, interest, costs and
        expenses, including, without limitation, reasonable fees and
        disbursements of counsel (collectively "Losses") arising from, in
                                               ------
        connection with, or incident to: (i) any breach or violation of any of
        the representations, warranties, covenants or agreements of
        Stockholder or MDI contained in this Agreement or in any document or
        certificate delivered by Stockholder or MDI at or prior to the
        Closing; and (ii) any and all actions, suits, proceedings, demands,
        assessments, judgments, costs and expenses incidental to any of the
        foregoing; provided, however, that notwithstanding the foregoing: (i)
                --------  -------
        this Section 6.4.1 shall not apply to the Raytel Litigation, the Lynch
             -------------
        Litigation or Assumed Employee Claims, and any indemnification with
        respect to the Raytel Litigation, the Lynch Litigation or Assumed
        Employee Claims shall be governed by Section 6.11; and (ii) this
                                             -------------
        Section 6.4.1 shall not apply to the extent a matter is covered by
        -------------
        Section 6.10.  
        ------------

                  6.4.2     Subject to the limitations set forth in Section
                                                                   --------
        6.4.4 hereof, USD agrees to indemnify and hold harmless Stockholder
        -----
        from, against and in respect of, the full amount of any and all Losses
        arising from, in connection with, or incident to: (i) any breach or
        violation of any of the representations, warranties, covenants or
        agreements of USD contained in this Agreement or in any document or
        certificate delivered by USD at or prior to the Closing; and (ii) any
        and all actions, suits, proceedings, demands, assessments, judgments,
        costs and expenses incidental to any of the foregoing.  

                  6.4.3     A party or parties hereto agreeing to be
        responsible for or to indemnify against any matter pursuant to this
        Section 6.4 is referred to herein as the "Indemnifying Party" and the
        -----------
        other party or parties claiming indemnity is referred to as the
        "Indemnified Party."  An Indemnified Party under this Agreement shall,
        with respect to claims asserted against such party by any third party,
        give written notice to each Indemnifying Party of any liability which
        might give rise to a claim for indemnity under this Agreement within
        ten (10) business days of the receipt of any written claim from any
        such third party, and with respect to other matters for which the
        Indemnified Party may seek indemnification, give prompt written notice
        to each Indemnifying Party; provided, however, that any failure to
                                    --------  -------
        give such notice will not waive any rights of the Indemnified Party
        except to the extent the rights of the Indemnifying Party are
        materially prejudiced.  The Indemnifying Party shall in good faith and
        at its sole cost and expense prosecute, contest and defend, by all
        appropriate legal proceedings, with counsel satisfactory to the
        Indemnified Party, all such claims.  The Indemnified Party shall have
        the right, at its own expense, to participate in such proceedings and
        to be represented by separate attorneys of its choice.  The
        Indemnified Party and the Indemnifying Party agree to afford one
        another the opportunity to be present at, and to participate in,
        conferences with all Persons asserting claims for which
        indemnification is sought hereunder.  The Indemnified Party and the
        Indemnifying Party shall actively cooperate with and assist each other
        to the extent lawful and reasonably possible.  The Indemnified Party
        shall be kept fully informed of the defense of any such claim at all
        stages thereof.  In the event that the Indemnifying Party fails to
        timely and in good faith defend against any such claim, the
        Indemnified Party shall, after providing 10 days prior written notice
        to the Indemnifying Party, have the right, but not the obligation, to
        defend the same and may make any compromise or settlement thereof and
        recover and be indemnified for the entire cost thereof from the
        Indemnifying Party.  If, in good faith, the Indemnified Party
        concludes that there are specific defenses or counterclaims available
        to the Indemnified Party which are different from or in addition to
        those available to the Indemnifying Party, or that such claims may
        have a material adverse effect on the Indemnified Party with respect
        to the scope of the foregoing indemnities, then the Indemnified Party
        shall have the right to direct the defense of any such claim and the
        Indemnifying Party shall bear the expenses thereof.  In the event that
        the Indemnified Party is, directly or indirectly, conducting a defense
        against any such claim, the Indemnifying Party shall cooperate with
        the Indemnified Party in any such defense and make available to it all
        such witnesses, records, materials and information in its possession
        or under its control.

                  6.4.4     Except as otherwise set forth herein, no party
        shall have any obligation under the indemnification provisions set
        forth in Sections 6.4.1 or 6.4.2: (i) unless notice of a claim for
              ------------------------
        indemnity in respect of any matter has been given such party on or
        before the date which is 18 months after the date of Closing,
        provided, however, that with respect to any tax matters, notice of a
        --------  -------
        claim for indemnity must be given on or before the date which is
        thirty (30) days after the expiration of the applicable statute of
        limitations; and (ii) until and only to the extent that the aggregate
        of all claims for which USD, on the one hand, or Stockholder, on the
        other hand, is responsible under the indemnification provisions of
        Sections 6.4.1 or 6.4.2, respectively, exceeds $500,000 (the "Basket
        -----------------------                                       ------
        Limitation"); and (iii) to the extent such liability exceeds
        ----------
        $3,000,000 in the aggregate (the "Cap Limitation").  Notwithstanding
                                          --------------
        any provision to the contrary set forth herein, none of the
        limitations of this Section 6.4.4 shall apply with respect to (or be
                            -------------
        considered in giving effect to) the indemnification obligations of a
        party arising in connection with the breach of any representation,
        warranty or covenant set forth in Sections 3.2, 4.2, 4.12, 4.13, 6.5,
                                          -----------------------------------
        6.8, 6.9, 6.10 and 6.11, hereof and none of the limitations of this
        --------------     -----
        Section 6.4.4 shall apply with respect to any action based upon
        -------------
        intentional and willful, or fraudulent actions, misrepresentations or
        breach of any party; and the Cap Limitation shall be inapplicable with
        respect to indemnification obligations of a party arising in
        connection with the breach of any provision of Articles II or V; and
                                                     ----------------
        the Basket Limitation shall be inapplicable  with respect to
        indemnification obligations of a party arising in connection with the
        breach of any provision of Article II or Sections 5.2 through 5.14;
                                   ----------    ------------         ----
        and the Basket Limitation with respect to indemnification obligations
        of a party arising in connection with the breach of any provision of
        Section 5.1 shall be $100,000, rather than $500,000.  By way of
        -----------
        example, any liability under Section 6.11 shall not be included when
                                     ------------
        calculating such $3,000,000 amount.  For purposes of the calculation
        under this subsection, there shall be an offset against claims of an
        amount equal to the amount of any cash payment actually received by an
        Indemnified Party after the Closing Date covering any such claim from
        any insurance policy. 

                  6.4.5     Except to the extent specifically provided for in
        Section 6.10, Section 6.11 or elsewhere herein, the parties hereto

        ------------  -------------
        agree that indemnification pursuant to this Section 6.4 is the sole
                                                    -----------
        and exclusive monetary remedy of the parties for breach of contract
        for the breach of any representation, warranty, covenant or agreement
        of any party hereto under this Agreement; provided, however, that the
                                                  --------  -------
        foregoing shall be inapplicable to intentional or willful breaches or
        violations and shall not preclude any party from pursuing any
        equitable remedies available to it.

             6.5  GENERAL RELEASE.  As a material inducement for USD and
                  ---------------
        Acquisition to enter into this Agreement, effective as the Effective
        Time, except as expressly set forth on Schedule 6.5, Stockholder, on
                                               ------------
        behalf of itself and its Subsidiaries (including MVA, Middlesex and
        MDI Rehab), hereby unconditionally and irrevocably releases and
        forever discharges, effective as of the Effective Time, MDI and its
        respective Subsidiaries from any and all rights, claims, demands,
        judgments, obligations, liabilities and damages, whether accrued or
        unaccrued, asserted or unasserted, and whether known or unknown,
        suspected or unsuspected, relating to MDI and/or any of its
        Subsidiaries which ever existed, now exist, or may hereafter exist, by
        reason of any tort, breach of contract, violation of law or other act
        or failure to act which shall have occurred at or prior to the
        Effective Time, including, but not limited to, any rights of
        subrogation with respect to obligations of MDI to Chase.  Stockholder
        expressly intends that the foregoing release shall be effective
        regardless of whether the basis for any claim or right hereby released
        shall have been known to or anticipated by Stockholder.

             6.6  ASSIGNMENT OF RIGHTS OF STOCKHOLDER UNDER 1995 ACQUISITION
                  ----------------------------------------------------------
        AGREEMENT.  Effective as of the Effective Time, Stockholder shall be
        ---------
        deemed to have assigned to USD all of its right, title and interest in
        and to, and all of its benefits and privileges (other than rights to
        bring or defend claims under the Lynch Litigation), if any, under the
        1995 Merger Agreement, including, but not limited to, those relating
        to indemnification, if any.

             6.7  DISCHARGE OF BANK DEBT.  Immediately prior to the Effective
                  ----------------------
        Time, Stockholder shall advise USD as to the exact amount of all of
        MDI's and its Subsidiaries' obligations to Chase, as of the Effective
        Time; and at the Effective Time, USD shall deliver such amount
        directly to Chase on behalf of MDI by wire transfer in partial
        satisfaction of the Merger Consideration and the amount to be paid to
        Stockholder in cash under Section 2.6(b) shall be reduced by such
                                  --------------
        amount.

             6.8  BLOCKED ACCOUNT, PLEDGE AND SECURITY AGREEMENT.  At the
                  ----------------------------------------------
        Closing, Stockholder shall transfer $1,000,000 of the Merger
        Consideration into a bank account and Stockholder shall also pledge
        1,250,000 shares of Advanced Mammography Systems, Inc. common stock,
        all to be held in accordance with the terms and conditions of the
        Blocked Account, Pledge and Security Agreement, attached hereto as
        Exhibit D.  USD and Stockholder agree to execute such Agreement at the
        ---------
        Closing.

             6.9  RESTRICTIVE COVENANTS.
                  ---------------------

                  6.9.1     NONCOMPETITION.  Stockholder recognizes that in
                            --------------
        order to assure USD and Acquisition that USD will retain the value of
        MDI as a "going concern," it is necessary that Stockholder undertakes
        not to utilize its special knowledge of the business of MDI and its
        relationship with customers and suppliers of MDI to compete with USD
        or MDI.  Stockholder hereby agrees that it shall, for a period of
        three (3) years after the Effective Time (such aggregate period being
        hereinafter referred to as the "Covenant Period"), refrain from,
        anywhere within a 50-mile radius of a site at which MDI or USD
        conducts business at any time during the Covenant Period, or has
        conducted business prior to the Effective Time, directly or
        indirectly, owning, managing, operating, controlling or financing, or
        participating in the ownership, management, operation, control or
        financing of, or being connected with or having any interest in, or
        otherwise taking any part as a stockholder, director, officer,
        employee, consultant, independent contractor, partner or otherwise in,
        any business competitive with that engaged in by MDI as of the
        Effective Time (excluding the business of MVA, MDI Rehab, Middlesex
        and Faulkner as of the Effective Time), including, but not limited to,
        providing radiology, MRI, CT or other diagnostic imaging services, but
        excluding breast imaging services and the research, development and
        commercialization of diagnostic imaging technology and products
        developed from such technology (the "Competitive Business"); provided,
                                                                     --------
        however, that the foregoing shall not apply solely to the ownership of
        -------
        not more than two percent (2%) of the outstanding stock of any company
        listed by a national securities exchange or an over-the-counter stock
        listed by the National Association of Securities Dealers, except the
        foregoing restriction shall not apply to the ownership by Stockholder
        of the securities of Advanced Mammography Systems, Inc.

                  6.9.2     CONFIDENTIAL INFORMATION.  Stockholder agrees not
                            ------------------------
        to at any time subsequent to the Effective Time, disclose, directly or
        indirectly, to any person or entity, or use or cause or authorize any
        person or entity to use any confidential information relating to MDI
        or any of its Subsidiaries or any information concerning financial
        condition, results of operations, customers, suppliers, services,
        inventions, sources, leads or methods of obtaining new products,
        services or business, intangible property or methods of operating
        their businesses or any other information relating to MDI or any of
        its Subsidiaries which Stockholder knows or should know is regarded as
        confidential and valuable by USD or MDI (whether or not any of the
        foregoing information is actually novel or unique or is actually known
        by others); provided, however, that this Section 6.9.2 shall not
                    --------  -------            -------------
        restrict the disclosure of confidential information (i) to any
        governmental entity to the extent required by law or (ii) which is
        publicly known and available through no wrongful act of Stockholder or
        its affiliates.

                  6.9.3     SOLICITATION OF BUSINESS.  During the Covenant
                            ------------------------
        Period, Stockholder agrees that it will not, directly or indirectly,
        at any time solicit or cause or authorize directly or indirectly to be
        solicited, or accept or cause or authorize directly or indirectly to
        be accepted, for or on behalf of itself or other persons or entities,
        any Competitive Business of MDI or any of its Subsidiaries from
        persons or entities who were customers of MDI or any of its
        Subsidiaries at any time within one year prior to the Effective Time.

                  6.9.4     SOLICITATION OF PERSONNEL.  During the Covenant
                            -------------------------
        Period, Stockholder agrees that it will not solicit or cause or
        authorize, directly or indirectly, to be solicited for employment or
        employ or cause or authorize, directly or indirectly, to be employed
        or engaged as an employee, independent contractor or sales agent, for
        or on behalf of itself or any other person or entity, any person who
        was an employee, independent contractor or sales agent of MDI or any
        of its Subsidiaries at the Effective Date or whose employment was
        terminated within three (3) months prior to or six months after the
        Effective Date by USD, MDI or any of its Subsidiaries; provided, that
                                                               --------
        the foregoing shall not apply to an employee of both MDI and its
        Subsidiaries and also of Stockholder and its Subsidiaries; and,
        provided, further, that the foregoing shall not apply to the Assumed
        --------  -------
        Employees or employees who perform duties principally for MVA, MDI
        Rehab, Middlesex or Faulkner.

                  6.9.5     USE OF SYMBOLS.  Stockholder agrees not to at any
                            --------------
        time after the Effective Time, directly or indirectly, use or
        authorize any person or entity (i) to use any name, mark, logo or
        other identifying words or images (collectively, "Symbols") which are
                                                         ---------
        similar to those used by MDI or any of its Subsidiaries in connection
        with any business product or service, whether or not competitive with
        any business then being carried on by MDI or any of its Subsidiaries
        or any product or service then being sold or provided by MDI or any of
        its Subsidiaries except to the extent that any such Symbols primarily
        relate to Stockholder.

                  6.9.6     INJUNCTIVE RELIEF.  Stockholder acknowledges that
                            -----------------
        it would be very difficult or impossible to measure the damages
        resulting from the breach of any provision of this Section 6.9. 
                                                           -----------
        Stockholder further acknowledges that the restrictions herein are
        reasonable and reasonably necessary for the protection of the
        legitimate business interests and goodwill of MDI and USD, and that a
        violation by Stockholder of any such covenant will cause irreparable
        damage to MDI and USD.  Therefore, Stockholder hereby agrees that any
        breach or threatened breach by it of any provision of this Section 6.9
                                                                  ------------
        shall entitle MDI and USD, in addition to any other legal remedies
        available to them, to a temporary and permanent injunction or any
        other appropriate decree of specific performance (without any bond or
        security being required) in order to enjoin such breach or threatened
        breach.  It is the desire and intent of the parties that the
        provisions of this Section 6.9 shall be enforced to the fullest extent
                           -----------
        permissible under the laws and public policies applied in each
        jurisdiction in which enforcement is sought.  Accordingly, if any
        particular subparagraph or portion of this Section 6.9 shall be
                                                   -----------
        adjudicated to be invalid or unenforceable, this Section 6.9 shall not
                                                         -----------
        be deemed null and void and shall be deemed amended to delete
        therefrom the portion thus adjudicated to be invalid or unenforceable,
        such deletion to apply only with respect to the operation of this
        Section 6.9 in that particular jurisdiction in which such adjudication
        -----------
        is made.  In the event any provisions of this Section 6.9 relating to
                                                      -----------
        the time period, scope of activities or areas of restrictions shall be
        declared by a court of competent jurisdiction to exceed the maximum
        time period, scope of activities or area such court deems reasonable
        and enforceable, the time period, scope of activities or areas of
        restrictions shall thereafter be deemed the maximum which such court
        deems reasonable and enforceable.

             6.10 TAX MATTERS.
                  -----------

                  6.10.1    Tax and Other Filings.  Upon the request of any
                            ---------------------
        party, each other party shall on and after the Closing Date cooperate
        with the requesting party and provide the requesting party with such
        information and execute and deliver such documents as the requesting
        party may reasonably request with respect to the filing and auditing
        of Tax Returns and financial statements with respect to any required
        filings with any government agencies or related claims with respect to
        MDI and its Subsidiaries for all periods prior to the Closing Date. 
        USD further agrees to maintain the records of MDI and its Subsidiaries
        received by reason of the Merger relating to the period prior to or
        after the Closing Date for a period of six years, provided that should

                                                           --------
        USD decide to dispose of any such records prior to the end of such six
        year period it shall give prior written notice to the Stockholder in
        order that the Stockholder may determine to take possession of any of
        the records sought to be disposed of.

                  6.10.2    Indemnification for Taxes.  Notwithstanding any
                            -------------------------
        provision to the contrary set forth in Section 6.4.4 hereof or any
                                               -------------
        other provision hereof, Stockholder agrees to indemnify and hold USD
        and MDI and its Subsidiaries and their respective successors and
        assigns harmless from, against and in respect of: (i) all liabilities,
        damages, claims, deficiencies, fines, assessments, losses, penalties,
        interest, costs and expenses for Taxes (including, but not limited to,
        those arising in connection with the transactions contemplated in
        connection herewith) attributable to all Tax years or portions thereof
        ending on or prior to the Closing Date imposed with respect to MDI or
        any of its Subsidiaries or any Affiliated Group of which MDI or any of
        its Subsidiaries was a member at any time prior to the Closing Date;
        and (ii) any and all actions, suits, proceedings, demands,
        assessments, judgments, costs (including, but not limited to,
        reasonable fees and disbursements of counsel) and expenses incidental
        to any of the foregoing.  Notwithstanding the foregoing, if a court of
        competent jurisdiction having final adjudicative authority and from
        which no appeal is available shall determine that a party is not
        entitled to indemnification with respect to a claim, then such party
        shall not be entitled to recover its legal fees with respect to such
        claim.

                  6.10.3    Returns for Tax Periods Ending on or Before the
                            -----------------------------------------------
         Closing Date.  Stockholder shall file (or cause to be filed) any Tax
        -------------
        Returns of MDI and its Subsidiaries for Tax periods ending on or
        before the Closing Date which are to be filed after the Closing Date. 
        Such Tax Returns shall be prepared on a basis consistent with past
        practice to the extent such past practice is consistent with all
        state, local and foreign Tax laws, rules and regulations.

                  6.10.4    Returns for Tax Periods Beginning Before and
                            --------------------------------------------
        Ending After the Closing Date.  USD shall file (or cause to be filed)
        -----------------------------
        any Tax Returns of MDI and its Subsidiaries for Tax periods which
        begin before the Closing Date and end after the Closing Date.  Such
        Tax Returns shall be prepared on a basis consistent with past practice
        to the extent such past practice is consistent with all state, local
        and foreign Tax laws, rules and regulations.  USD shall send copies of
        such Tax Returns to Stockholder.  Stockholder shall pay to USD within
        ten days of the date on which Taxes are paid with respect to such
        periods an amount equal to the Tax liability of MDI and its
        Subsidiaries for the portion of such period ending on the Closing
        Date, subject to reasonable objection by Stockholder to the
        calculations pursuant to Section 6.10.5.  Such Tax liability shall be
        computed as if the Tax periods of MDI and its Subsidiaries ended on
        the Closing Date and included an allocable share of the income,
        deductions and other Tax items of MDI and its Subsidiaries.  The
        income, deductions and other Tax items of MDI and its Subsidiaries for
        such Tax periods shall be allocated to the portion of the period
        ending on the Closing Date and the portion of the period beginning
        after the Closing Date by closing the books of MDI and its
        Subsidiaries as of the end of the Closing Date.

                  6.10.5    Calculation of Indemnity.  The party seeking
                            ------------------------
        indemnification shall give the other party written notice of such
        claim for indemnification pursuant to this Section 6.10 which notice
                                                   ------------
        shall include a calculation of the amount of the requested indemnity
        payment.  In the event of a dispute, the party presenting a claim for
        indemnification shall be notified in writing by the party required to
        indemnify as to the amount of the claim that is disputed and the basis
        therefor.  In such event, the calculation shall be reviewed by a
        nationally recognized independent certified public accounting firm for
        the party presenting the claim.  For purposes of this Section 6.10.5,
                                                              --------------
        and the calculation of any indemnity under this Section 6.10, interest
                                                        ------------
        or penalties accruing after the Closing Date with respect to a
        liability for a Tax attributable to a taxable period ending on or
        prior to the Closing Date shall be deemed to be attributable to a
        taxable period ending on or prior to the Closing Date.  If the
        indemnifying party after consultation with its nationally recognized
        independent certified accounting firm disagrees with the calculation
        of the indemnity payment, such disagreement shall be referred for
        resolution to such other nationally recognized independent certified
        public accounting firm as is mutually agreed upon by the parties.  The
        decision of such firm shall be final and binding on the parties.  The
        fees of such other public accounting firm shall be shared equally by
        Stockholder and USD.  Neither party may select a public accounting
        firm which is then or had been within the prior two years retained by
        such party for accounting services.

             6.11 OTHER INDEMNIFICATIONS.
                  -----------------------

                  6.11.1    Notwithstanding any provision to the contrary set
        forth herein, Stockholder agrees to indemnify and hold harmless USD
        and MDI and their respective Affiliates, successors and assigns from,
        against and in respect of, and be primarily liable for, the full
        amount of any and all Losses arising from, in connection with, or
        incident or relating to: (i) the lawsuits styled Medical Diagnostics,
                                                        --------------------
        Inc., et al v. Medical Imaging Partners, L.P., et al (Middlesex
        -----------    -------------------------------------
        (County) Superior Court, Commonwealth of Massachusetts, Civil Docket
        No. MICV92-95872) and/or Raytel Medical Corporation v. Medical
                                  -------------------------     --------
        Diagnostics, Inc., et al (Court of Chancery of the State of Delaware,
        ------------------------
        New Castle County, Case No. 13905) and any actions, suits or other
        proceedings by Raytel to enjoin the Merger and all claims,
        counterclaims, actions and/or causes of action of Raytel and/or any
        other Person relating to or arising in connection with Mass. Mobile
        Imaging Venture ("MMIV") or relating to the facts and circumstances
        giving rise to such matters (the "Raytel Litigation"); and (ii) all
        actions, suits, proceedings, demands, assessments, judgments, costs
        and expenses incidental to any of the foregoing.  Notwithstanding
        anything to the contrary set forth herein, such indemnity shall not be
        interpreted or construed to cover fees or disbursements of counsel to
        MDI which accrued and were paid prior to January 1, 1997. 
        Notwithstanding anything to the contrary set forth herein, such
        indemnity shall not pertain to any action taken, or, if a duty to act
        exists not taken, by MDI or its Subsidiaries (other than MVA, MDI
        Rehab and Middlesex) which is unrelated to the Raytel Litigation which
        arises, accrues or occurs solely after the Effective Time and over
        which USD had control.  Notwithstanding the foregoing, such indemnity
        shall not pertain to the distribution of undistributed profits of MMIV
        for the period ended December 31, 1996 to Raytel, to the distribution
        of a portion of MMIV's assets as of December 31, 1996 to Raytel in
        liquidation of MMIV or to reasonable and customary out-of-pocket
        expenses incurred in the liquidation of MMIV, in each instance in
        accordance with the general partnership agreement of MMIV which
        provides for the dissolution of MMIV as of December 31, 1996.  Without
        limiting the generality of the foregoing, the parties intend for the
        foregoing indemnity to be interpreted and construed broadly: (i) to
        fully indemnify, hold harmless and compensate USD and MDI and their
        respective Affiliates, successors and assigns from, against and in
        respect of any determination, ruling, judgment, award, order or other
        finding relating to the Raytel Litigation in favor of Raytel or its
        Affiliates or not in favor of MDI or any of its Affiliates, including,
        but not limited to, any determination that Raytel is or may be
        entitled to any revenues or profits relating to MMIV's or any of its
        Affiliates' activities or operations after December 31, 1996; (ii) so
        as to place USD and MDI and their respective Subsidiaries, successors
        and assigns in the same position as if the Raytel Litigation were
        dismissed with prejudice without cost or adverse effect to MDI or USD
        or their respective Affiliates, successors or assigns on January 1,
        1997; and (iii) so as to place USD and MDI and their respective
        Subsidiaries, successors and assigns in the same position as if Raytel
        had executed a general release in favor of each of them (except with
        respect to the above-referenced permitted distributions by MMIV to
        Raytel) as of January 1, 1997 without adverse cost or effect to any of
        them.  Subject to the foregoing provisions, in the event that MDI is
        awarded and receives any monetary damages against Raytel in the Raytel
        Litigation pursuant to a final judgment of a court of competent
        jurisdiction which is not subject to further appeal, then if and only
        to the extent that USD and MDI have been fully indemnified and held
        harmless as provided above (and received full and final payment
        therefor without offset), and all cases comprising the Raytel
        Litigation have been settled or decided by a trial court of competent
        jurisdiction, then Stockholder shall be entitled to the net amount
        (i.e., after giving effect to any indemnity payment under this Section
         ----                                                          -------
         6.11) of any such monetary award against Raytel.  Any payment under
        ----
        this Section 6.11 relating to fees and disbursements of counsel to MDI
             ------------
        shall be made within ten business days after demand.  Any other
        payment under this Section 6.11 shall be made within ten business days
                           ------------
        after any settlement or court order, judgment or ruling with respect
        thereto.  

                  6.11.2    Notwithstanding any provision to the contrary set
        forth herein, Stockholder agrees to indemnify and hold harmless USD
        and MDI and their respective Affiliates, successors and assigns from,
        against and in respect of, and be primarily liable for, the full
        amount of any and all Losses arising from, in connection with, or
        incident or relating to: (i) existing litigation, arbitration or other
        proceedings to which MDI and its former chief executive officer, John
        Lynch, are parties (and all facts and circumstances giving rise
        thereto), and all claims, counterclaims, actions, causes of action and
        similar items of any nature whatsoever of John Lynch or his executors,
        personal representatives, successors or assigns against MDI or any of
        its Affiliates (collectively, the "Lynch Litigation"); and (ii) and
                                           -----------------
        all actions, suits, proceedings, demands, assessments, judgments,
        costs and expenses incidental to any of the foregoing. 
        Notwithstanding anything to the contrary set forth herein, such
        indemnity shall not be interpreted or construed to cover fees or
        disbursements of counsel which accrued and were paid prior to January
        1, 1997.  Without limiting the generality of the foregoing, the
        parties intend for the foregoing indemnity to be interpreted and
        construed broadly so as to place USD and MDI in the same position as
        if John Lynch executed a general release in favor of MDI, USD and
        their respective Affiliates, successors and assigns effective as of
        January 1, 1997 without adverse cost or effect to any of them.

                  6.11.3    Notwithstanding any provision to the contrary set
        forth herein, Stockholder agrees to indemnify and hold harmless USD
        and MDI and their respective Affiliates, successors and assigns from,
        against and in respect of, and be primarily liable for, the full
        amount of any and all Losses arising from, in connection with, or
        incident or relating to: (i) any claim, counterclaim, action, cause of
        action or demand of any nature whatsoever, of any Assumed Employee,
        which ever existed, now exists or may hereafter exist, by reason of
        any tort, breach of contract, violation of law or other act or failure
        to act which occurred prior to the Effective Time; (ii) any claim,
        counterclaim, action, cause of action or demand of any nature
        whatsoever of any Assumed Employee relating to such individual's
        employment agreement(s) or arrangements with MDI and/or any of its
        Subsidiaries, including, but not limited to, any claims for salary or
        benefits (including, but not limited to, deferred compensation,
        accrued vacation and severance benefits); and (iii) all actions,
        suits, proceedings, demands, assessments, judgments, costs and
        expenses incidental to any of the foregoing.  Without limiting the
        generality of the foregoing, the parties intend for the foregoing
        indemnity to be interpreted and construed broadly so as to place USD
        and MDI in the same position as if all such individuals had agreed to
        terminate their respective employment and related agreements as of the
        Effective Time and executed a general release in favor of MDI, USD and
        their respective Affiliates, successors and assigns effective as of
        the Effective Time without adverse cost or effect to MDI, USD and
        their respective Affiliates, successors and assigns.  Any and all of
        the foregoing matters are hereafter referred to as "Assumed Employee
                                                            ----------------
        Claims".
        -------

                  6.11.4    The parties expressly acknowledge and agree that,
        notwithstanding any other provision to the contrary set forth in this
        Agreement, the limitations of Section 6.4.4 shall be inapplicable to
                                      -------------
        this Section 6.11.
             ------------

                  6.11.5    Stockholder shall in good faith and at its sole
        cost and expense prosecute, contest and defend, by all appropriate
        legal proceedings, with counsel satisfactory to USD (USD hereby
        acknowledges that Stockholder's present counsel in the Raytel
        Litigation and the Lynch Litigation is satisfactory to USD), the
        Raytel Litigation, the Lynch Litigation and any Assumed Employee
        Claims.  USD shall have the right to participate in such proceedings
        and to be represented by separate attorneys of its choice at its own
        cost and expense provided such participation does not hinder the
        proceedings.  In the event that, after the Effective Time, USD
        determines, in its reasonable judgment, after written notice to
        Stockholder specifying the grounds for its determination and an
        opportunity to cure, that Stockholder is not in good faith
        prosecuting, contesting and defending the Raytel Litigation, the Lynch
        Litigation or any Assumed Employee Claims by all appropriate legal
        proceedings, then USD, upon notice to Stockholder, shall have the
        right, but not the obligation, to assume such prosecution, contest and
        defense and compromise and settle the same, all at Stockholder's sole
        cost and expense, and Stockholder shall cooperate therewith.  USD
        shall have the right to approve any settlement of the Raytel
        Litigation and/or the Lynch Litigation and/or any Assumed Employee
        Claims, which approval shall not be unreasonably withheld (it being
        understood that it shall not be unreasonable to withhold consent to
        any settlement involving injunctive or other equitable relief or any
        settlement to the extent Stockholder could not immediately indemnify
        the indemnified parties in full in cash under this Section 6.11). 
                                                           ------------
        Stockholder agrees to afford USD and its counsel the opportunity to be
        present at, and to participate in, all conferences with Raytel or its
        counsel relating to the Raytel Litigation and/or the Lynch Litigation
        and/or any Assumed Employee Claims.  Stockholder shall keep USD fully
        informed of the Raytel Litigation, the Lynch Litigation and any
        Assumed Employee Claims.


                                     ARTICLE VII

                      CLOSING; CONDITIONS PRECEDENT; TERMINATION
                      ------------------------------------------


             7.1  CLOSING.  At the Closing, the parties shall deliver to each
                  -------
        other such documents as may be specified, or required to satisfy the
        conditions set forth, in Sections 7.2, 7.3 and 7.4, and such other
                                 -------------------------
        documents and instruments as each party may reasonably request from
        the other party.  All proceedings to be taken and all documents to be
        executed at the Closing shall be deemed to have been taken, delivered
        and executed simultaneously, and no proceeding shall be deemed taken
        nor documents deemed executed or delivered until all have been taken,
        delivered and executed.

             7.2  MUTUAL CONDITIONS PRECEDENT.  The respective obligations of
                  ---------------------------
        the parties to consummate the transactions contemplated by this
        Agreement are subject to the satisfaction at or prior to the Closing
        of the following conditions.

                  (a)  GOVERNMENTAL CONSENTS.  All consents and approvals
                       ---------------------
        required by governmental authorities for the consummation of the
        transactions contemplated by this Agreement shall have been obtained,
        including without limitation, the expiration or termination of any
        notice and waiting period under the HSR Act.  

                  (b)  NO LITIGATION.  No litigation, arbitration or other
                       -------------
        proceeding shall be pending or, to the knowledge of the parties,
        threatened by or before any court, arbitration panel or governmental
        authority; no law or regulation shall have been enacted after the date
        of this Agreement; and no judicial or administrative decision shall
        have been rendered; in each case, which enjoins, prohibits or
        materially restricts the consummation of the transactions contemplated
        by this Agreement.

             7.3  CONDITIONS PRECEDENT TO THE OBLIGATIONS OF USD.  The
                  ----------------------------------------------
        obligations of USD to consummate the transactions contemplated by this
        Agreement are subject to the satisfaction at or prior to the Closing
        of the following conditions.

                  (a)  REPRESENTATIONS AND WARRANTIES TRUE.  The
                       -----------------------------------
        representations and warranties of Stockholder and MDI contained in
        this Agreement and in any certificate or notice delivered pursuant to
        this Agreement shall be true and correct in all material respects
        (except for representations and warranties which are by their terms
        qualified by materiality, which shall be true and correct in all
        respects after giving effect to the materiality qualification
        contained in such representations and warranties) as of the Closing
        Date with the same force and effect as though made on and as of such
        date, except to the extent that such representations and warranties by
        their terms are specifically made as of an earlier date.

                  (b)  COVENANTS PERFORMED.  The covenants of Stockholder and
                       -------------------
        MDI contained in this Agreement to be performed or complied with on or
        prior to the Closing Date shall have been duly performed or complied
        with in all material respects.

                  (c)  NO MATERIAL ADVERSE CHANGE.  Since the date of this
                       --------------------------
        Agreement, (i) there shall not have been disclosed or occurred any
        event or condition of any character which has adversely affected or
        could adversely affect in any material respect USD's ability to
        operate the business of MDI, (ii) no event or condition shall have
        occurred which has adversely affected or could adversely affect in any
        material respect the financial condition, results of operations,
        assets, liabilities, business or prospects of MDI and its Subsidiaries
        on a consolidated basis and (iii) there shall have occurred no
        material deterioration in the financial condition, results of
        operations, assets, liabilities, business or prospects of MDI and its
        Subsidiaries on a consolidated basis.  

                  (d)  CONSENTS.  Stockholder shall have obtained all consents
                       --------
        and approvals required to effectuate the transactions contemplated
        herein or otherwise contemplated herein on behalf of MDI and its
        Subsidiaries, all of which shall have been obtained without the
        imposition of any materially adverse terms or condition.

                  (e)  OPINION OF COUNSEL.  USD shall have received from Reid
                       ------------------
        & Priest, LLP, legal counsel to Stockholder, an opinion letter, dated
        the Closing Date, in form and substance reasonably satisfactory to
        USD, with respect to the matters set forth in Exhibit E to this
                                                      ---------
        Agreement, which matters shall include a separate opinion from Ashby &
        Geddes that stockholder approval by Stockholder's stockholders is not
        required under the Delaware GCL for MDI to consummate the Merger.

                  (f)  AUDITORS' "COMFORT" LETTERS.  USD shall have received
                       ---------------------------
        from Richard A. Eisner & Company, LLP, auditors for Stockholder, a
        letter dated as of a date not more than two days prior to the Closing
        Date, in form and substance reasonably satisfactory to USD, with
        respect to the matters set forth in Exhibit F to this Agreement and
                                            ---------
        such additional matters reasonably requested by USD.

                  (g)  CERTIFICATE OF STOCKHOLDER.  Stockholder shall have
                       -------------------------
        delivered to USD a certificate executed by its Chief Executive Officer
        and Chief Financial Officer, dated the Closing Date, certifying in
        such detail as USD may reasonably request, that the conditions
        specified in Sections 7.3(a), (b) and (c) above have been fulfilled
                  ----------------------------
        and as to such other matters as USD may reasonably request.

                  (h)  SALE OR ASSIGNMENT OF INTEREST IN MDI REHAB, MIDDLESEX,
                       -------------------------------------------------------
        MVA AND FAULKNER.  MDI shall have transferred or assigned its interest
        ----------------
        in MDI Rehab, Middlesex, MVA and in Faulkner and caused MDI and its
        Subsidiaries to be released from any obligations relating to Faulkner,
        MDI Rehab, Middlesex or MVA, pursuant to the terms of the Agreements
        attached hereto as Exhibits B and C, respectively.

                  (i)  TERMINATION OF MDI'S OBLIGATIONS UNDER EMPLOYMENT
                       -------------------------------------------------
        AGREEMENTS.  Stockholder shall have assumed all of MDI's and its
        ----------
        Subsidiaries' obligations under and relating to their employment
        agreements with each of the Assumed Employees.

                  (J)  INTERCOMPANY RECEIVABLES.  All obligations of
                       ------------------------
        Stockholder and its Subsidiaries (except MDI and its Subsidiaries) and
        MVA and MDI Rehab and Middlesex to MDI and its Subsidiaries shall have
        been satisfied in accordance with their terms.

                  (K)  RESIGNATIONS.  Stockholder shall have delivered such
                       ------------
        resignations of officers and directors of MDI and its Subsidiaries as
        USD shall have requested.

             7.4  CONDITIONS PRECEDENT TO THE OBLIGATIONS OF STOCKHOLDER AND
                  ----------------------------------------------------------
        MDI.  The obligations of Stockholder and MDI to consummate the
        ---
        transactions contemplated by this Agreement are subject to the
        satisfaction at or prior to the Closing of the following conditions.

                  (a)  REPRESENTATIONS AND WARRANTIES TRUE.  The
                       -----------------------------------
        representations and warranties of USD contained in this Agreement or
        in any certificate or notice delivered pursuant to this Agreement
        shall be true and correct in all material respects (except for
        representations and warranties which are by their terms qualified by
        materiality, which shall be true and correct in all respects after
        giving effect to the materiality qualifications contained in such
        representations and warranties) as of the Closing Date with the same
        force and effect as though made on and as of such date, except to the
        extent such representations and warranties by their terms are
        specifically made as of an earlier date.

                  (b)  COVENANTS PERFORMED.  The covenants of USD contained in
                       -------------------
        this Agreement to be performed or complied with on or prior to the
        Closing Date shall have been duly performed or complied with in all
        material respects.

                  (c)  NO MATERIAL ADVERSE CHANGE.  No event or condition
                       --------------------------
        shall have occurred which has adversely affected or may reasonably be
        expected to adversely affect in any material respect the ability of
        USD to consummate the transactions contemplated hereby.

                  (d)  OPINION OF COUNSEL.  Stockholder shall have received
                       ------------------
        from Stearns Weaver Miller Weissler Alhadeff & Sitterson, P.A., legal
        counsel to USD, an opinion letter, dated the Closing Date, in form and
        substance reasonably satisfactory to Stockholder, with respect to the
        matters set forth in Exhibit G to this Agreement.
                       ---------

                  (e)  USD'S CERTIFICATE.  USD shall have delivered to
                       -----------------
        Stockholder a certificate executed by its President or a Vice
        President, dated the Closing Date, certifying in such detail as
        Stockholder may reasonably request, that the conditions specified in
        Sections 7.4(a), (b) and (c) above have been fulfilled.
        ----------------------------

                  (f)  TERMINATION OF GUARANTEES.  The Stockholder shall be
                       -------------------------
        released from its obligations under the guarantees listed in Schedule
                                                                     -------
        5.12 or USD shall indemnify it therefrom.
        ----

                  (g)  INTERCOMPANY RECEIVABLES.  All obligations of MDI and
                       ------------------------
        its Subsidiaries to Stockholder for advances subsequent to the date
        hereof which are set forth on Schedule 5.1 as to be satisfied as of
                                      ------------
        the Closing shall have been satisfied.

                  (h)  MMIV ESCROW.  All rights of MDI and Western
                       -----------
        Massachusetts Magnetic Resonance Services, Inc. under the MDI Escrow
        Agreement at Fleet Bank shall have been assigned to Stockholder.

             7.5  TERMINATION.  This Agreement and the transactions
                  -----------
        contemplated hereby may be terminated prior to the Closing:

                  (a)  at any time by mutual consent of the parties;

                  (b)  by either party if the Closing has not occurred on or
        prior to April 30, 1997 (the "Termination Date"), provided the failure
                                      ----------------
        of the Closing to occur by such date is not the result of the failure
        of the party seeking to terminate this Agreement to perform or fulfill
        any of its obligations hereunder; 

                  (c)  by USD at any time in its sole discretion if any of the
        representations or warranties of Stockholder in this Agreement are not
        in all material respects true and accurate or if Stockholder breaches
        in any material respect any covenant contained in this Agreement,
        provided that if such misrepresentation or breach is curable, it is
        not cured within ten business days after written notice thereof
        specifying the nature of the breach, but in any event prior to the
        Termination Date; 

                  (d)  by MDI or Stockholder at any time in its sole
        discretion if any of the representations or warranties of USD or
        Acquisition in this Agreement are not in all material respects true
        and accurate or if USD or Acquisition breaches in any material respect
        any covenant contained in this Agreement, provided that if such
        misrepresentation or breach is curable, it is not cured within ten
        business days after written notice thereof specifying the nature of
        the breach, but in any event prior to the Termination Date; or 

                  (e)  subject to the payment of the termination fee referred
        to in Section 8.7, by either USD or Stockholder, if MDI's or
              -----------
        Stockholder's Board of Directors has accepted or recommended or
        resolved to accept or recommend to their respective stockholders in
        accordance with their fiduciary duties under Delaware law, an
        Acquisition Transaction which, after consultation with and based on
        the advice of their independent counsel (which may include regularly
        engaged independent counsel) and financial advisers, MDI's or
        Stockholder's Board of Directors has determined in good faith to be
        more favorable to the stockholders of MDI and Stockholder than the
        Merger from a financial point of view.

                  In the event this Agreement is terminated pursuant to this
        Section 7.5, this Agreement shall terminate and become void and of no
        -----------
        force and effect, the Merger shall be abandoned without further action
        by any of the parties to this Agreement, and no party to this
        Agreement shall have any liability or further obligation under this
        Agreement, except for the agreements contained in Sections 5.3
                                                          -------------
        (Confidentiality), 8.7 (Fees and Expenses), 8.10 (Litigation;
                           ----                     ----
        Prevailing Parties), 8.12 (Governing Law) and 8.13 (Jurisdiction and
                            ----                     ----
        Venue); provided that, unless payments are fully made under Section
                -------                                             --------
        8.7, any termination of this Agreement pursuant to this Section 7.5
        ---                                                     ------------
        shall not relieve any party from any liability for the breach of any
        representation, warranty or covenant contained in this Agreement or be
        deemed to constitute a waiver of any remedy available for such breach.


                                     ARTICLE VIII

                                    MISCELLANEOUS
                                    -------------

             8.1  NOTICES.  Any notice or other communication under this
                  -------
        Agreement shall be in writing and shall be delivered personally or
        sent by registered mail, return receipt requested, postage prepaid, or
        sent by prepaid overnight courier to the parties at the addresses set
        forth below their names on the signature pages of this Agreement (or
        at such other addresses as shall be specified by the parties by like
        notice), to the attention of the President of such party.  Such
        notices, demands, claims and other communications shall be deemed
        given when actually received or: (A) in the case of delivery by
        overnight service with guaranteed next day delivery, the next day or
        the day designated for delivery; or (B) in the case of registered U.S.
        mail, five days after deposit in the U.S. mail.

             8.2  ENTIRE AGREEMENT.  This Agreement and the Confidentiality
                  ----------------
        Agreement among the parties contain every obligation and understanding
        between the parties relating to the subject matter hereof and merge
        all prior discussions, negotiations and agreements, if any, between
        them, and none of the parties shall be bound by any representations,
        warranties, covenants, or other understandings, other than as
        expressly provided or referred to herein.  In the event that any term
        herein is inconsistent with any term in such Confidentiality
        Agreement, the provision providing the greater restriction as to
        confidentiality shall govern.

             8.3  ASSIGNMENT.  This Agreement may not be assigned by any party
                  ----------
        without the written consent of the other parties.  Subject to the
        preceding sentence, this Agreement shall be binding upon and inure to
        the benefit of the parties hereto and their respective successors, and
        permitted assigns.

             8.4  WAIVER AND AMENDMENT.  Any representation, warranty,
                  --------------------
        covenant, term or condition of this Agreement which may legally be
        waived, may be waived, or the time of performance thereof extended, at
        any time by the party hereto entitled to the benefit thereof, and any
        term, condition or covenant hereof may be amended by the parties
        hereto at any time.  Any such waiver, extension or amendment shall be
        evidenced by an instrument in writing executed on behalf of the
        appropriate party by a person who has been authorized by its Board of
        Directors to execute waivers, extensions or amendments on its behalf. 
        No waiver by any party hereto, whether express or implied, of its
        rights under any provision of this Agreement shall constitute a waiver
        of such party's rights under such provisions at any other time or a
        waiver of such party's rights under any other provision of this
        Agreement.  No failure by any party hereto to take any action against
        any breach of this Agreement or default by another party shall
        constitute a waiver of the former party's right to enforce any
        provision of this Agreement or to take action against such breach or
        default or any subsequent breach or default by such other party.

             8.5  NO THIRD PARTY BENEFICIARY.  Nothing expressed or implied in
                  --------------------------
        this Agreement is intended, or shall be construed, to confer upon or
        give any Person other than the parties hereto and their respective
        successors and permitted assigns, any rights or remedies under or by
        reason of this Agreement.

             8.6  SEVERABILITY.  In the event that any one or more of the
                  ------------
        provisions contained in this Agreement shall be declared invalid, void
        or unenforceable, the remainder of the provisions of this Agreement
        shall remain in full force and effect, and such invalid, void or
        unenforceable provision shall be interpreted as closely as possible to
        the manner in which it was written.

             8.7  EXPENSES; TERMINATION FEE.
                  ------------------------- 

                  (a)  EXPENSES.  All expenses (including, without limitation,
                       --------
        legal fees and expenses, investment banking fees, fees and expenses of
        accountants) incurred by Stockholder or MDI in connection with the
        transactions contemplated hereby will be borne by Stockholder on
        behalf of MDI, and all expenses incurred by USD or Acquisition in
        connection with the transactions contemplated hereby will be borne by
        USD, except that USD shall bear all filing fees payable with respect
        to filings required by the HSR Act and if this Agreement is terminated
        other than pursuant to Section 7.5(d) the Stockholder shall reimburse
                         --------------
        USD for one-half of such filing fees.

                  (b)  TERMINATION FEE.  If this Agreement is terminated (A)
                       ---------------
        pursuant to Section 7.5(e), (B) pursuant to Section 7.5(c) as a result
                    --------------                  -------------
        of an intentional or willful breach by Stockholder or MDI of any
        representation, warranty or covenant by either of them contained
        herein, or (C) pursuant to Section 7.5 (c) as a result of the breach
                               ----------------
        by Stockholder of any representation or warranty contained in Section
                                                                      -------
        4.2, then Stockholder and MDI shall jointly and severally pay USD an
        ---
        amount equal to $1,000,000 if so terminated pursuant to Section 7.5(e)
                                                                --------------
        and $500,000 if so terminated pursuant to Section 7.5(c).  If this
                                                  --------------
        Agreement is terminated (A) pursuant to Section 7.5(d) as a result of
                                                --------------
        an intentional or willful breach by USD or Acquisition of any
        representation, warranty or covenant by either of them contained
        herein or (B) pursuant to Section 7.5(d) as a result of any breach by
                                   --------------
        USD of any representation or warranty contained in Section 3.2, then
                                                           -----------
        USD shall pay Stockholder $500,000.  Any amount payable under this
        Section 8.7(b) shall be payable in accordance with Section 8.7(d).
        --------------                                     --------------
                  (c)  CALCULATION.  Each party agrees that the actual damages
                       ------------
        accruing to the other party from termination of this Agreement
        pursuant to those termination provisions referenced in this Section
                                                                    --------
        8.7 are incapable of precise estimation and would be difficult to
        ---
        prove, and that the damages stipulated herein bear a reasonable
        relationship to the potential injury likely to be sustained in the
        event of termination pursuant to such occurrence.  The payments
        stipulated in this Section 8.7 are intended by the parties to provide
                           ------------
        just compensation in the event of termination and is not intended to
        constitute a penalty for nonperformance.

                  (d)  TIME OF PAYMENT.  Any payment required to be made
                       ---------------
        pursuant to this Section 8.7 shall be made to the party entitled to
                         -----------
        payment not later than five business days after the occurrence of the
        event for which the party is entitled to payment as provided for
        herein.  All payments required to be made pursuant to this Section 8.7
                                                                   ----------
        shall be made by wire transfer of immediate available funds to an
        account designated by the party entitled to payment.

             8.8  HEADINGS.  The section and other headings contained in this
                  --------
        Agreement are for reference purposes only and shall not affect the
        meaning or interpretation of any provisions of this Agreement.

             8.9  COUNTERPARTS.  This Agreement may be executed in any number
                  -------------
        of counterparts, each of which shall be deemed an original but all of
        which together shall constitute one and the same instrument.  Any
        telecopied counterpart of a manually executed original shall be deemed
        a manually executed original.

             8.10 LITIGATION; PREVAILING PARTY.  In the event of any
                  ----------------------------
        litigation with regard to this Agreement, the prevailing party with
        respect to a claim shall be entitled to receive from the
        non-prevailing party with respect to such claim and such
        non-prevailing party shall pay upon demand all reasonable fees and
        expenses of counsel for such prevailing party.

             8.11 INJUNCTIVE RELIEF.  It is possible that remedies at law may
                  -----------------
        be inadequate and, therefore, the parties hereto shall be entitled to
        equitable relief including, without limitation, injunctive relief,
        specific performance or other equitable remedies in addition to all
        other remedies provided hereunder or available to the parties hereto
        at law or in equity.

             8.12 GOVERNING LAW.  This Agreement has been entered into and
                  -------------
        shall be construed and enforced in accordance with the laws of the
        State of Delaware without reference to the choice of law principles
        thereof.

             8.13 JURISDICTION AND VENUE.  This Agreement shall be subject to
                  ----------------------
        the exclusive jurisdiction of the courts of the State of Florida.  The
        parties to this Agreement agree that any breach of any term or
        condition of this Agreement shall be deemed to be a breach occurring
        in the State of Florida by virtue of a failure to perform an act
        required to be performed in the State of Florida and irrevocably and
        expressly agree to submit to the jurisdiction of the courts of the
        State of Florida for the purpose of resolving any disputes among the
        parties relating to this Agreement or the transactions contemplated
        hereby.  The parties irrevocably waive, to the fullest extent
        permitted by law, any objection which they may now or hereafter have
        to the laying of venue of any suit, action or proceeding arising out
        of or relating to this Agreement, or any judgment entered by any court
        in respect hereof brought in the State of Florida, and further
        irrevocably waive any claim that any suit, action or proceeding
        brought in the State of Florida has been brought in an inconvenient
        forum.

             8.14 OBLIGATIONS OF MDI.  Notwithstanding any provision to the
                  ------------------
        contrary set forth herein, after the Effective Time, Stockholder: (i)
        shall be solely responsible for all representations, warranties,
        covenants and agreements of MDI set forth herein, as if Stockholder
        (and not MDI) had made such representations, warranties, covenants and
        agreements, and Stockholder shall cause MDI not to breach any such
        representation or warranty or violate any such covenant or agreement;
        and (ii) irrevocably waives any right that it may have to seek
        indemnity or contribution or any similar remedy from MDI with respect
        to any such matter.



                           [SIGNATURES BEGIN ON NEXT PAGE]


   <PAGE> 


             IN WITNESS WHEREOF, the parties hereto have each executed and
        delivered this Agreement as of the day and year first above written.

                                      USD
                                      ----

                                      US DIAGNOSTIC INC.


                                      By:/s/ Jeffrey Goffman
                                         ------------------------------------
                                      Name: Jeffrey Goffman
                                     Title: CEO

                                      777 South Flagler Drive
                                      Suite 1006-W
                                      West Palm Beach, Florida 33401


                                      ACQUISITION
                                      -----------

                                      MDI ACQUISITION CORPORATION


                                      By: Jeffrey Goffman
                                         ------------------------------------
                                      Name: Jeffrey Goffman
                                      Title: President

                                      777 South Flagler Drive
                                      Suite 1006-W
                                      West Palm Beach, Florida 33401



                          [SIGNATURES CONTINUE ON NEXT PAGE]


   <PAGE> 


                                      STOCKHOLDER
                                      -----------

                                      ADVANCED NMR SYSTEMS, INC.


                                      By:/s/ Jack Nelson
                                         ------------------------------------
                                      Name: Jack Nelson
                                      Title:  Chairman

                                      46 Jonspin Road
                                      Wilmington, Massachusetts  01887


                                      MDI
                                      ---

                                      MEDICAL DIAGNOSTICS, INC.



                                      By: /s/ Jack Nelson 
                                         ------------------------------------
                                      Name: Jack Nelson 
                                      Title: Chairman

                                      46 Jonspin Road
                                      Wilmington, Massachusetts  01887



          NEWS RELEASE
          ------------                                         Advanced NMR
                                                              -------------
          Contact: Beverly Tkaczenko at                        Systems, Inc
                   1 (800) 476 0569

           ----------------------------------------------------------------

                    ADVANCED NMR SYSTEMS, INC. ANNOUNCES MERGER OF
                  IMAGING SERVICES DIVISION WITH U.S. DIAGNOSTIC INC.



          Wilmington, MA, January 20, 1997 --- Advanced NMR Systems, Inc.
          (NASDAQ: ANMR) announced today that its wholly owned subsidiary,
          Medical Diagnostics, Inc. ("MDI"), pursuant to a definitive
          agreement entered into by MDI and by ANMR as MDI's stockholder,
          will merge with a newly formed subsidiary of US Diagnostic Inc.
          (NASDAQ:  USDL) in exchange for approximately $22.0 million in
          cash (which includes approximately $12.0 million for repayment of
          bank debt).

          Upon the merger, USDL will gain a medical imaging services
          business that owns and operates diagnostic imaging facilities in
          Massachusetts, New York, Virginia, West Virginia and Tennessee. 
          Following the transaction, however, ANMR will continue to own and
          to operate MDI's rehabilitation business and to own its interest
          in the Faulkner Hospital Sagoff Women's Center (under
          development), both of which will be transferred to ANMR
          concurrent with the transaction.  ANMR will also continue to own
          and to operate its medical imaging technology business and to own
          its stake in Advanced Mammography Systems, Inc. (NASDAQ: MAMO).

          The transaction is expected to close as soon as practicable after
          receipt of certain government consents including consent of the
          Federal Trade Commission under the Hart-Scott-Rodino Antitrust
          Improvements Act.

          Commenting on the transaction, Jack Nelson, Chairman and CEO of
          ANMR, said "We have been pleased with the results of our medical
          imaging services business since we acquired MDI in 1995, and we
          believe that its prospects continue to be bright.  Nevertheless,
          our financial position, weakened by continuing losses from our
          technology operations, has not allowed us to invest in the
          imaging services business or in MDI's other businesses to the
          degree we had hoped when we originally completed the acquisition. 
          This transaction, combined with the elimination over the past few
          months of significant costs from our technology operations, gives
          us the financial security and liquidity to invest in our
          rehabilitation business and to drive creation of shareholder
          value from our imaging technologies."

          This press release contains forward looking information based
          upon current expectations that include a number of business risks
          and uncertainties.  The factors that could cause results to
          differ materially include the following:  delays in product
          development, lack of market acceptance of technology,
          technological innovations for competitors and changes in health
          care regulations, including reimbursement.

          Advanced NMR Systems, Inc. is a provider of diagnostic imaging
          and rehabilitation services through its wholly owned subsidiary
          Medical Diagnostics, Inc., and develops high field MRI
          technology.  Its subsidiary, Advanced Mammography Systems, Inc.
          has developed the only dedicated breast imaging system based on
          magnetic resonance imaging technology.  MAMO has received U.S.
          Food and Drug Administration clearance to begin marketing
          activities for the product.
                                         # # 



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