content: <PAGE>
  
                         SECURITIES AND EXCHANGE COMMISSION
                              Washington, D. C.  20549
  
  
                                      FORM 8-K
  
  
                       Pursuant to Section 13 or 15(d) of the
                          Securities Exchange Act of 1934
  
        Date of Report (Date of earliest event reported): September 27, 2000
  
                                 ACUSON CORPORATION
               (Exact name of registrant as specified in its charter)
  
                                      Delaware
                   (State or other jurisdiction of incorporation)
  
            1-10068                                  94-2784998
      (Commission File No.)                (IRS Employer Identification No.)
  
                                1220 Charleston Road
                            Mountain View, CA 94039-7393
               (Address of principal executive offices and zip code)
  
         Registrant's telephone number, including area code: (650) 969-9112
  
  
  
                               ---------------------
  <PAGE>
  
  Item 5.  Other Events
  
       This Current Report on Form 8-K contains forward-looking statements within
  the meaning of Section 27A of the Securities Act of 1933, as amended, and
  Section 21E of the Securities Exchange Act of 1934, as amended.  The forward-
  looking statements contained herein involve risks and uncertainties, including
  those relating to the possible inability to complete the transaction involving
  Acuson Corporation, a Delaware corporation ("Acuson"), and Siemens Corporation,
  a Delaware corporation ("Siemens"), as scheduled, or at all, and those
  associated with the ability of the combined company to achieve the anticipated
  benefits of the transaction.   Actual results and developments may differ
  materially from those described or incorporated by reference in this Report.
  For more information about Acuson and risks arising when investing in Acuson,
  investors are directed to Acuson's most recent report on Form 10-K as filed with
  the Securities and Exchange Commission.
  
       On September 27, 2000, Acuson announced that it entered into a definitive
  agreement with Siemens under which Siemens will acquire through a wholly owned
  subsidiary for cash all of the outstanding stock of Acuson through a two-step
  transaction comprised of a tender offer followed by a merger. The definitive
  merger agreement is subject to the satisfaction of certain conditions contained
  therein, including the expiration or early termination of the waiting period
  under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and
  receipt of the necessary clearance from the German antitrust authority.
  
       Acuson's press release, dated September 27, 2000, entitled "Acuson
  Corporation Announces Definitive Merger Agreement with Siemens" is attached
  hereto as Exhibit 99.1.
  
       In connection with the execution of the merger agreement, Acuson amended
  its stockholders' rights plan to provide, among other things, that no person or
  entity would be considered to be an "acquiring person" thereunder by reason of
  any transaction contemplated by the merger agreement.  The amendment, dated
  September 26, 2000, to Acuson's amended and restated rights agreement, dated
  September 26, 2000, is attached hereto as Exhibit 4.1.
  
  Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits
  
  (c) Exhibits
  
      Exhibit
      Number  Description
      ------  -----------
  
       4.1    Amendment to Amended and Restated Rights Agreement Between Acuson
       Corporation and BankBoston, N.A., dated September 26, 2000.
       99.1   Press Release dated September 27, 2000.
  
                                         2
  <PAGE>
  
                                     SIGNATURES
  
       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 hereunto duly authorized.
  
  
                                         ACUSON CORPORATION
  
  
  Dated:  October 2, 2000                 By: /s/   Charles H. Dearborn
                                              ------------------------------------
                                              Charles H. Dearborn
                                              Vice President, Human Resources and
                                              Legal Affairs, General Counsel and
                                              Secretary
  
                                         3
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text: SECURITIES AND EXCHANGE COMMISSION
                              Washington, D. C.  20549
  
                                      FORM 8-K
  
                       Pursuant to Section 13 or 15(d) of the
                          Securities Exchange Act of 1934
  
        Date of Report (Date of earliest event reported): September 27, 2000
  
                                 ACUSON CORPORATION
               (Exact name of registrant as specified in its charter)
  
                                      Delaware
                   (State or other jurisdiction of incorporation)
  
            1-10068                                  94-2784998
      (Commission File No.)                (IRS Employer Identification No.)
  
                                1220 Charleston Road
                            Mountain View, CA 94039-7393
               (Address of principal executive offices and zip code)
  
         Registrant's telephone number, including area code: (650) 969-9112
  
                               ---------------------
  Item 5.  Other Events
  
       This Current Report on Form 8-K contains forward-looking statements within
  the meaning of Section 27A of the Securities Act of 1933, as amended, and
  Section 21E of the Securities Exchange Act of 1934, as amended.  The forward-
  looking statements contained herein involve risks and uncertainties, including
  those relating to the possible inability to complete the transaction involving
  Acuson Corporation, a Delaware corporation ("Acuson"), and Siemens Corporation,
  a Delaware corporation ("Siemens"), as scheduled, or at all, and those
  associated with the ability of the combined company to achieve the anticipated
  benefits of the transaction.   Actual results and developments may differ
  materially from those described or incorporated by reference in this Report.
  For more information about Acuson and risks arising when investing in Acuson,
  investors are directed to Acuson's most recent report on Form 10-K as filed with
  the Securities and Exchange Commission.
  
       On September 27, 2000, Acuson announced that it entered into a definitive
  agreement with Siemens under which Siemens will acquire through a wholly owned
  subsidiary for cash all of the outstanding stock of Acuson through a two-step
  transaction comprised of a tender offer followed by a merger. The definitive
  merger agreement is subject to the satisfaction of certain conditions contained
  therein, including the expiration or early termination of the waiting period
  under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and
  receipt of the necessary clearance from the German antitrust authority.
  
       Acuson's press release, dated September 27, 2000, entitled "Acuson
  Corporation Announces Definitive Merger Agreement with Siemens" is attached
  hereto as Exhibit 99.1.
  
       In connection with the execution of the merger agreement, Acuson amended
  its stockholders' rights plan to provide, among other things, that no person or
  entity would be considered to be an "acquiring person" thereunder by reason of
  any transaction contemplated by the merger agreement.  The amendment, dated
  September 26, 2000, to Acuson's amended and restated rights agreement, dated
  September 26, 2000, is attached hereto as Exhibit 4.1.
  
  Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits
  
  (c) Exhibits
  
      Exhibit
      Number  Description
      ------  -----------
  
       4.1    Amendment to Amended and Restated Rights Agreement Between Acuson
       Corporation and BankBoston, N.A., dated September 26, 2000.
       99.1   Press Release dated September 27, 2000.
  
                                         2
  SIGNATURES
  
       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 hereunto duly authorized.
  
                                         ACUSON CORPORATION
  
  Dated:  October 2, 2000                 By: /s/   Charles H. Dearborn
                                              ------------------------------------
                                              Charles H. Dearborn
                                              Vice President, Human Resources and
                                              Legal Affairs, General Counsel and
                                              Secretary
  
                                         3