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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>UNITED
        STATES</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SECURITIES
        AND EXCHANGE COMMISSION</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington,
        D.C. 20549</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>Form
        8-K</strong></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>Current
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        to Section 13 or 15(d) of the Securities Exchange Act of
        1934</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
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        of
        Report</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>&#160;</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Date
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        October 11, 2005</strong></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>RITA
        Medical Systems, Inc.</strong></font></div>
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              <td valign="top" width="40%">
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                  Employer Identification No.)</font></div>
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        771-0400</strong></font></div>
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        the
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        satisfy the filing obligation of the registrant under any of the following
        provisions (</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>see</em></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
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            <tr valign="top" style="LINE-HEIGHT: 1.25">
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        three month period ended September 30, 2005. A copy of the Company's press
        release announcing and commenting upon these financial results is attached
        as
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        Products, Inc. for the period from July 1, 2004 through July 28, 2004. Horizon's
        sales results for this period are not included in the Company's GAAP sales
        results for the third quarter of 2004 because its merger with Horizon was
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              <td align="left" valign="top" width="10%" style="BORDER-BOTTOM: #ffffff">&#160;</td>
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              <td align="left" valign="top" width="6%" bgcolor="#ffffff" style="BORDER-BOTTOM: #ffffff">&#160;</td>
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                  Release of RITA Medical Systems, Inc. dated October 11,
                  2005</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
        to the requirements of the Securities Exchange Act of 1934, the Registrant
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        duly authorized.</font></div>
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              <tr valign="top" bgcolor="#ffffff">
                <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
                <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
                <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
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              <tr valign="top" bgcolor="#ffffff">
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                <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>RITA
                  MEDICAL SYSTEMS, INC.</strong></font></td>
              </tr>
              <tr valign="top" bgcolor="#ffffff">
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
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              <tr valign="top" bgcolor="#ffffff">
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:&#160;October
                  12, 2005</font></td>
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:&#160;&#160;</font></td>
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/&#160;Joseph
                  DeVivo</font></td>
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                <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
                <td>
                  <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Joseph
                    DeVivo</font></div>
                  <div><font size="2">President and Chief Executive
                    Officer</font></div>
                </td>
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        MEDICAL SYSTEMS, INC.</strong></font></div>
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        TO EXHIBITS</strong></font></div>
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                  Release of RITA Medical Systems, Inc. dated October 11,
                  2005</font></div>
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{"company-data": {"conformed-name": "RITA MEDICAL SYSTEMS INC", "cik": "0001056421", "assigned-sic": "3845", "irs-number": "943199149", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-30959", "film-number": "051133764"}, "business-address": {"street1": "967 N SHORELINE BLVD", "city": "MOUNTAIN VIEW", "state": "CA", "zip": "94013", "phone": "6503858500"}, "mail-address": {"street1": "967 NORTH SHORELINE BLVD", "city": "MOUNTAIN VIEW", "state": "CA", "zip": "94043"}}
UNITED
        STATES
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):
October 11, 2005
RITA
        Medical Systems, Inc.
(Exact
        name of registrant as specified in its charter)
000-30959
(Commission
        File Number)
Delaware
94-3199149
(State
                  or other jurisdiction of incorporation)
(I.R.S.
                  Employer Identification No.)
46421
        Landing Parkway
Fremont,
        CA 94538
(Address
        of principal executive offices, with zip code)
(510)
        771-0400
(Registrant's
        telephone number, including area code)
Check
        the
        appropriate box below if the Form 8-K filing is intended to simultaneously
        satisfy the filing obligation of the registrant under any of the following
        provisions (
see
General
        Instruction A.2. below):
o
Written
                  communications pursuant to Rule 425 under the Securities Act (17
                  CFR
                  230.425)
o
Soliciting
                  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
                  240.14a-12)
o
Pre-commencement
                  communications pursuant to Rule 14d-2(b) under the Exchange Act
                  (17 CFR
                  240.14d-2(b))
o
Pre-commencement
                  communications pursuant to Rule 13e-4(c) under the Exchange Act
                  (17 CFR
                  240.13e-4(c))
Item
        2.02
Results
        of Operations and Financial Condition.
On
        October 11, 2005, RITA Medical Systems, Inc., a Delaware corporation (the
        "Company"), provided a preliminary financial outlook for the third quarter and
        three month period ended September 30, 2005. A copy of the Company's press
        release announcing and commenting upon these financial results is attached
        as
        Exhibit 99.1 hereto and incorporated by reference herein.
The
        Company uses, and the press release refers to, a non-GAAP measure of sales
        for
        the third quarter of 2004. The Company uses a non-GAAP measure of sales for
        the
        third quarter of 2004 that includes the sales results of Horizon Medical
        Products, Inc. for the period from July 1, 2004 through July 28, 2004. Horizon's
        sales results for this period are not included in the Company's GAAP sales
        results for the third quarter of 2004 because its merger with Horizon was
        not
        completed until July 29, 2004. The Company uses this non-GAAP measure of
        sales
        because management believes it facilitates a more meaningful comparison with
        sales results for the quarter ended September 30, 2005. Reconciliation of
        this
        measure to the most directly comparable GAAP measure is included in the press
        release.
Item
        9.01
Financial
        Statements and Exhibits.
(c)
Exhibits:
99.1
Press
                  Release of RITA Medical Systems, Inc. dated October 11,
                  2005
-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.
RITA
                  MEDICAL SYSTEMS, INC.
Date: October
                  12, 2005
By:
/s/ Joseph
                  DeVivo
Joseph
                    DeVivo
President and Chief Executive
                    Officer
-3-
RITA
        MEDICAL SYSTEMS, INC.
INDEX
        TO EXHIBITS
Exhibit
                  Number
Description
99.1
Press
                  Release of RITA Medical Systems, Inc. dated October 11,
                  2005
-4-