EXHIBIT 4.2 COMMON STOCK COMMON STOCK INSIGHT HEALTH SERVICES CORP. INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE THIS TO CERTIFY THAT CUSIP IS OWNER OF FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK, PAR VALUE $.01, OF =========================INSIGHT HEALTH SERVICES CORP.========================== TRANSFERABLE ON THE BOOKS OF THE CORPORATION BY THE HOLDER HEREOF IN PERSON OR BY DULY AUTHORIZED ATTORNEY, UPON SURRENDER OF THIS CERTIFICATE PROPERLY ENDORSED. THIS CERTIFICATE IS NOT VALID UNTIL COUNTERSIGNED BY THE TRANSFER AGENT AND REGISTERED BY THE REGISTRAR. WITNESS THE FACSIMILE SEAl AND FACSIMILE SIGNATURES OF HIS DULY AUTHORIZED OFFICERS. DATED: [SEAL] INSIGHT HEALTH SERVICES CORP. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM -as tenants in common UNIF GIFT MIN ACT - ........Custodian...... (Cust) (Minor) TEN ENT -as tenants by the entities Under Uniform Gifts to Minors ST TEN -as joint tenants with Act.............. (State) right of survivorship and not as tenants in common Additional abbreviations may also be used though not the above list. For value received ......................... hereby sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER BY ASSIGNEE [ ]................................................ ................................................................................ Please print or typewrite name and address including postal zip code of assignee ................................................................................ ................................................................................ ..........................................................................Shares of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint ............................................. ................................................................................ Attorney to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises. Dated, ............................. ............................................... SIGNATURE(S) GUARANTEED:________________________________________________________ NOTICE: The signature to this assignment must correspond with the name as written upon the face of the Certificate, in every particular, without alteration or enlargement, or any change whatever