SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                   ----------


                    Under the Securities Exchange Act of 1934

                                  SCHEDULE 13G


             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934




                            RITA MEDICAL SYSTEMS, INC.
                              --------------------
                                (Name of Issuer)



                     Common Stock, $.001 par value per share
                     ---------------------------------------
                         (Title of Class of Securities)



                                    76774E103
                                  ------------
                                 (CUSIP Number)

                                  January 4, 2007
             ------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         |_|  Rule 13d-1(b)
         |X| Rule 13d-1(c)
         |_| Rule 13d-1(d)


                               Page 1 of 2 Pages




                                  SCHEDULE 13G

CUSIP No. 76774E103                                          Page 2 of 2 Pages
-------------------------------------------------------------------------------
1)  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    BRENCOURT ADVISORS, LLC      EIN # 13-4137530
-------------------------------------------------------------------------------
2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP         (a)   |_|

                                                             (b)   |X|
-------------------------------------------------------------------------------
3)  SEC USE ONLY


-------------------------------------------------------------------------------
4)  CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware
-------------------------------------------------------------------------------
                                5)     SOLE VOTING POWER

       NUMBER                          2,329,392
       OF                     --------------------------------------------------
       SHARES                   6)     SHARED VOTING POWER
       BENEFICIALLY
       OWNED BY                        0
       EACH                   --------------------------------------------------
       REPORTING                7)     SOLE DISPOSITIVE POWER
       PERSON
       WITH                            2,329,392
                              --------------------------------------------------
                                8)     SHARED DISPOSITIVE POWER

                                       0
-------------------------------------------------------------------------------
9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    2,329,392
-------------------------------------------------------------------------------
10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

                                                           |_|
-------------------------------------------------------------------------------
11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    5.31%
-------------------------------------------------------------------------------
12) TYPE OF REPORTING PERSON

    IA
-------------------------------------------------------------------------------
 



Schedule 13G

Item 1(a).

Name of Issuer: Rita Medical Systems, Inc.

Item 1(b).   Address of Issuer's Principal Executive Offices:

46421 Landing Parkway
Fremont, CA

Item 2(a).   Name of Persons Filing:

Brencourt Advisors, LLC


Item 2(b).   Address of Principal Business Office or, if None, Residence:

600 Lexington Avenue
8th Floor
New York, NY 10022

Item 2(c).   Citizenship:

Delaware

Item 2(d).   Title of Class of Securities:

Common Stock, $0.01 par value per share

Item 2(e).   CUSIP Number:

76774E103

Item 3.      If this statement is filed pursuant to ss.ss. 240.13d-1(b), or
             240.13d-2(b) or (c), check whether the person filing is a:

            (a)   |_| Broker or Dealer Registered Under Section 15 of the Act
                  (15 U.S.C. 78o)

            (b)   |_| Bank as defined in section 3(a)(6) of the Act (15 U.S.C.
                  78c)


            (c)   |_| Insurance Company as defined in section 3(a)(19) of the
                  Act (15 U.S.C. 78c)

            (d)   |_| Investment Company registered under section 8 of the
                  Investment Company Act of 1940 (15 U.S.C. 80a-8)

            (e)   |X| Investment Adviser in accordance with ss.
                  240.13d-1(b)(1)(ii)(E)

            (f)   |_| Employee benefit plan or endowment fund in accordance with
                  ss. 240.13d-1(b)(1)(ii)(F)

            (g)   |_| Parent Holding Company or control person in accordance
                  with ss.240.13d-1(b)(ii)(G)

            (h)   |_| Savings Association as defined in ss.3(b) of the Federal
                  Deposit Insurance Act (12 U.S.C. 1813)

            (i)   |_| Church plan that is excluded from the definition of an
                  investment company under ss.3(c)(15) of the Investment Company
                  Act of 1940 (15 U.S.C. 80a-3)

            (j)   |_| Group, in accordance with ss.240.13d-1(b)(ii)(J)

Item 4.      Ownership.

(i)         Brencourt Advisors, LLC

            (a)   Amount beneficially owned: 2,329,392

            (b)   Percent of class: 5.31% (1)

            (c)   Number of shares as to which such person has:

                  (i)   Sole power to vote or to direct the vote: 2,329,392

                  (ii)  Shared power to vote or to direct the vote: 0

                  (iii) Sole power to dispose or to direct the disposition of:
                        2,329,392

                  (iv)  Shared power to dispose or to direct the disposition of:
                        0
---------------
(1) Percentages are based on 43,885,857 shares of Common Stock outstanding as of
December 31, 2006 (as set forth on the Issuer's
most recent proxy statement).




Item 5.    [X] Ownership of Five Percent or Less of a Class.



Item 6.      Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7.      Identification and Classification of the Subsidiary Which Acquired
             the Security Being Reported on by the Parent Holding Company.

Not applicable.

Item 8.      Identification and Classification of Members of the Group.

Not applicable.

Item 9.      Notice of Dissolution of Group.

Not applicable.

Item 10.     Certification.

                  By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired and are held in the
ordinary course of business and were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having such purpose or effect.






                                    SIGNATURE
                                    ----------


             After reasonable inquiry and to the best knowledge and belief of
the undersigned, the undersigned certifies that the information set forth in
this Statement is true, complete and correct.


Dated as of January 4, 2007


                             Brencourt Advisors, LLC
                             By:  Michael Palmer
                                  Chief Financial Officer

                             By:   /s/  Michael Palmer
                                --------------------------------------