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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: 14pt; 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: 14pt; 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"><br></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>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></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: 18pt; FONT-FAMILY: Times New Roman"><strong>Form
      8-K</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></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: 18pt; FONT-FAMILY: Times New Roman"><strong>Current
      Report</strong></font><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>&#160;</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></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>Pursuant
      to Section 13 or 15(d) of the Securities Exchange Act of
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      of
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      August 8, 2006</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>
    <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">(Exact
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      other jurisdiction of incorporation)</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 33pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 33pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 33pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 33pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      (I.R.S.
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      771-0400</strong></font></div>
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      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 (</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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                communications pursuant to Rule 425 under the Securities Act (17
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br>&#160;</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 style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
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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">On
      August
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      will announce its financial results for the second quarter ended June 30, 2006.
      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. </font></div>
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      Company uses, and the press release contains and the related conference call
      will include, the non-GAAP metrics of pro-forma loss and EBITDA (earnings before
      interest, taxes, depreciation and amortization and excluding FASB 123R stock
      compensation expense) for the periods ended June 30, 2006 and June 30, 2005,
      and
      pro-forma net loss outlook for the quarter ending September 30, 2006 and year
      ending December 31, 2006. The calculation of pro-forma net loss and EBITDA
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      no basis in GAAP. The Company believes that all of these non-GAAP financial
      measures provide useful information to investors, permitting a better evaluation
      of the Company&#8217;s ongoing and underlying business performance, including the
      evaluation of its performance against its competitors in the healthcare
      industry. A reconciliation of these non-GAAP financial measures for historical
      periods to the most directly comparable GAAP measures is presented in the
      accompanying tables to the press release. Additionally, a reconciliation between
      the GAAP net loss and the pro-forma net loss for the Company&#8217;s outlook for the
      quarter ending September 30, 2006 and the year ending December 31, 2006 is
      included in an accompanying table to the press release.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
        information in this Form 8-K and the exhibit attached hereto shall not be
        deemed
&#8220;filed&#8221; for purposes of Section 18 of the Securities Exchange Act of 1934, as
        amended, (the &#8220;Exchange Act&#8221;) or otherwise subject to the liabilities of that
        section, nor shall it be deemed incorporated by reference in any filing under
        the Securities Act of 1933, as amended, or the Exchange Act, regardless of
        any
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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">(c)</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 33pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibits:</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; 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">99.1</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 33pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
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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
      has
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      duly authorized.</font></div>
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      <table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">

          <tr valign="top" bgcolor="#ffffff">
            <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
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          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: "><strong>RITA
              MEDICAL SYSTEMS, INC.</strong></font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
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          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Date:&#160;August
              8, 2006</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">By:&#160;&#160;</font></td>
            <td><font size="2">/s/ Michael D. Angel</font>&#160;</td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td colspan="2"><font style="FONT-FAMILY: " size="1">&#160;</font></td>
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              <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font size="2">Michael
              D. Angel</font></td>
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              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Chief
                Financial Officer</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: 10pt; FONT-FAMILY: Times New Roman"><strong>RITA
      MEDICAL SYSTEMS, INC.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></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>INDEX
      TO EXHIBITS</strong></font></div>
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                Number</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 style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
                Release of RITA Medical Systems, Inc. dated August 8, 2006</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": "061013081"}, "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"}}
Unassociated Document
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):
August 8, 2006
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
      August
      8, 2006, RITA Medical Systems, Inc., a Delaware corporation (the "Company"),
      will announce its financial results for the second quarter ended June 30, 2006.
      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 contains and the related conference call
      will include, the non-GAAP metrics of pro-forma loss and EBITDA (earnings before
      interest, taxes, depreciation and amortization and excluding FASB 123R stock
      compensation expense) for the periods ended June 30, 2006 and June 30, 2005,
      and
      pro-forma net loss outlook for the quarter ending September 30, 2006 and year
      ending December 31, 2006. The calculation of pro-forma net loss and EBITDA
      have
      no basis in GAAP. The Company believes that all of these non-GAAP financial
      measures provide useful information to investors, permitting a better evaluation
      of the Company's ongoing and underlying business performance, including the
      evaluation of its performance against its competitors in the healthcare
      industry. A reconciliation of these non-GAAP financial measures for historical
      periods to the most directly comparable GAAP measures is presented in the
      accompanying tables to the press release. Additionally, a reconciliation between
      the GAAP net loss and the pro-forma net loss for the Company's outlook for the
      quarter ending September 30, 2006 and the year ending December 31, 2006 is
      included in an accompanying table to the press release.
The
        information in this Form 8-K and the exhibit attached hereto shall not be
        deemed
"filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as
        amended, (the "Exchange Act") or otherwise subject to the liabilities of that
        section, nor shall it be deemed incorporated by reference in any filing under
        the Securities Act of 1933, as amended, or the Exchange Act, regardless of
        any
        general incorporation language in such filing.
Item
      9.01
Financial
      Statements and Exhibits.
(c)
Exhibits:
99.1
Press
      Release of RITA Medical Systems, Inc. dated August 8, 2006
-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: August
              8, 2006
By:
/s/ Michael D. Angel
Michael
              D. Angel
Chief
                Financial Officer
-3-
RITA
      MEDICAL SYSTEMS, INC.
INDEX
      TO EXHIBITS
Exhibit
                Number
Description
99.1
Press
                Release of RITA Medical Systems, Inc. dated August 8, 2006
-4-