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</HEAD>
<BODY>
<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: 12pt; FONT-FAMILY: Times New Roman"><STRONG>SECURITIES
AND EXCHANGE COMMISSION</STRONG></FONT><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>&nbsp;</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
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>
<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">Date of
Report</FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><STRONG>&nbsp;</STRONG></FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Date of
earliest event reported):</FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><STRONG>
May 19, 2005</STRONG></FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><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>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
name of registrant as specified in its charter)</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>000-30959</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">(Commission
File Number)</FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=center><BR></DIV>
<DIV>
<TABLE cellSpacing=0 cellPadding=0 width="100%">
  <TR>
    <TD vAlign=top align=middle width="40%">
      <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>California</STRONG></FONT></DIV></TD>
    <TD vAlign=top align=middle width="40%">
      <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>94-3199149</STRONG></FONT></DIV></TD></TR>
  <TR>
    <TD vAlign=top align=middle width="40%">
      <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">(State
      or other jurisdiction of incorporation)</FONT></DIV></TD>
    <TD vAlign=top align=middle width="40%">
      <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">(I.R.S.
      Employer Identification No.)</FONT></DIV></TD></TR>
  <TR>
    <TD vAlign=top align=middle width="40%">&nbsp;</TD>
    <TD vAlign=top align=left width="40%">&nbsp;</TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><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>46421
Landing Parkway</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>Fremont,
CA 94538</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">(Address
of principal executive offices, with zip code)</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>(510)
771-0400</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">(Registrant's
telephone number, including area code)</FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=center>&nbsp;</DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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 (</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"> General
Instruction A.2. below):</FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=justify>&nbsp;</DIV>
<DIV>
<TABLE id=hangingindent cellSpacing=0 cellPadding=0 width="100%" align=center
border=0>
  <TR style="LINE-HEIGHT: 1.25" vAlign=top>
    <TD style="WIDTH: 18pt">&nbsp;</TD>
    <TD style="WIDTH: 18pt">
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      face=Wingdings>o</FONT></DIV></TD>
    <TD>
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</FONT></DIV></TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=justify>&nbsp;</DIV>
<DIV>
<TABLE id=hangingindent cellSpacing=0 cellPadding=0 width="100%" align=center
border=0>
  <TR style="LINE-HEIGHT: 1.25" vAlign=top>
    <TD style="WIDTH: 18pt">&nbsp;</TD>
    <TD style="WIDTH: 18pt">
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      face=Wingdings>o</FONT></DIV></TD>
    <TD>
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</FONT></DIV></TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=justify>&nbsp;</DIV>
<DIV>
<TABLE id=hangingindent cellSpacing=0 cellPadding=0 width="100%" align=center
border=0>
  <TR style="LINE-HEIGHT: 1.25" vAlign=top>
    <TD style="WIDTH: 18pt">&nbsp;</TD>
    <TD style="WIDTH: 18pt">
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      face=Wingdings>o</FONT></DIV></DIV></TD>
    <TD>
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))</FONT></DIV></TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=justify>&nbsp;</DIV>
<DIV>
<TABLE id=hangingindent cellSpacing=0 cellPadding=0 width="100%" align=center
border=0>
  <TR style="LINE-HEIGHT: 1.25" vAlign=top>
    <TD style="WIDTH: 18pt">&nbsp;</TD>
    <TD style="WIDTH: 18pt">
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      face=Wingdings>o</FONT></DIV></DIV></TD>
    <TD>
      <DIV style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><FONT
      style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))</FONT></DIV></TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=justify>&nbsp;</DIV>
<DIV><BR></DIV>
<DIV id=PGBRK style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
<DIV id=FTR>
<DIV id=GLFTR style="WIDTH: 100%" align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV>
<DIV id=PN style="PAGE-BREAK-AFTER: always">
<DIV style="WIDTH: 100%; TEXT-ALIGN: center"><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt" face="Times New Roman"></FONT></DIV>
<DIV style="WIDTH: 100%; TEXT-ALIGN: center">
<HR color=#000000 noShade SIZE=2>
</DIV></DIV>
<DIV id=HDR>
<DIV id=GLHDR style="WIDTH: 100%" align=right><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV></DIV>
<DIV><BR></DIV>
<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
1.01</STRONG></FONT><FONT id=TAB2
style="COLOR: black; LETTER-SPACING: 27pt">&nbsp;</FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><STRONG>Entry
into a Material Definitive Agreement</STRONG></FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<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 May
19, 2005, RITA Medical Systems, Inc. (the "Company") entered into a
separation agreement and mutual release with Donald Stewart. The agreement is
described more fully in Item 5.02 below, which description is incorporated into
this Item 1.01 in its entirety. </FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<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
5.02 </STRONG></FONT><FONT id=TAB2
style="COLOR: black; LETTER-SPACING: 27pt">&nbsp;</FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><STRONG>Departures
of Directors or Principal Officers; Election of Directors; </STRONG></FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><STRONG>Appointment
of Principal Officers.</STRONG></FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On May
24, 2005, the Company issued a press release, attached as Exhibit 99.1 to this
Form 8-K, announcing that Donald Stewart, Chief Financial Officer and Vice
President, Finance and Administration of the Company, will be leaving the
Company to pursue other business interests once a new Chief Financial Officer
for the Company is hired. The Company also announced that Mr. Stewart will
remain actively involved as the Company&#8217;s Chief Financial Officer during the
recruiting and transition periods. </FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
connection with Mr. Stewart&#8217;s planned departure, the Company and Mr. Stewart
entered into a Separation Agreement and Mutual Release with the Company (the
"Agreement"). The Agreement provides, among other things, that (i) Mr. Stewart
shall resign as Chief Financial Officer and Vice President, Finance and
Administration of the Company and terminate his employment with the Company on
the earlier of October 19, 2005 or such date as determined by the Board of
Directors of the Company (the "Separation Date"), (ii) the Company shall pay Mr.
Stewart his annual base salary of $205,000 for a six month period beginning
immediately following the Separation Date, (iii) the Company shall pay Mr.
Stewart a retention bonus of $30,000 unless Mr. Stewart voluntarily resigns his
employment with the Company prior to the Separation Date, (iv) the Company shall
pay Mr. Stewart's health insurance premiums for a six month period beginning
immediately following the Separation Date, and (v) all of Mr. Stewart's options
to purchase shares of the Company's common stock shall be fully vested and
exercisable until the later of the expiration date set forth in the applicable
option agreement and December 31, 2005. In the Agreement, the Company and Mr.
Stewart release one another from all claims that each has or may have against
the other. Mr. Stewart has until May 26, 2005 to revoke the Agreement. The
Agreement is attached as Exhibit 10.88 to this Form 8-K.</FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<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
9.01</STRONG></FONT><FONT id=TAB2
style="COLOR: black; LETTER-SPACING: 27pt">&nbsp;</FONT><FONT
style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><STRONG>Financial
Statements and Exhibits.</STRONG></FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<DIV>
<TABLE id=hangingindent
style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" cellSpacing=0
cellPadding=0 width="100%" align=center border=0>
  <TR style="LINE-HEIGHT: 1.25" vAlign=top>
    <TD style="WIDTH: 27pt"></TD>
    <TD style="WIDTH: 36pt" align=left><FONT
      style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(c)</FONT></TD>
    <TD align=left><FONT
      style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibits:</FONT></TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<DIV align=left>
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TR>
    <TD width="12%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left width="7%">
      <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">10.88</FONT></DIV></TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left width="80%">
      <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">Separation
      Agreement and Mutual Release, dated May 19, 2005, between RITA Medical
      Systems, Inc. and Donald Stewart</FONT></DIV></TD></TR>
  <TR>
    <TD width="12%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left
    width="7%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left
    width="80%">&nbsp;</TD></TR>
  <TR>
    <TD width="12%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left
    width="7%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left
    width="80%">&nbsp;</TD></TR>
  <TR>
    <TD width="12%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left width="7%">
      <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">99.1</FONT></DIV></TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left width="80%">
      <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 May 24,
2005</FONT></DIV></TD></TR>
  <TR>
    <TD width="12%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left
    width="7%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: medium none" vAlign=top align=left
    width="80%">&nbsp;</TD></TR></TABLE></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><BR></DIV>
<DIV id=PGBRK style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
<DIV id=FTR>
<DIV id=GLFTR style="WIDTH: 100%" align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV>
<DIV id=PN style="PAGE-BREAK-AFTER: always">
<DIV style="WIDTH: 100%; TEXT-ALIGN: center"><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt" face="Times New Roman"></FONT></DIV>
<DIV style="WIDTH: 100%; TEXT-ALIGN: center">
<HR color=#000000 noShade SIZE=2>
</DIV></DIV>
<DIV id=HDR>
<DIV id=GLHDR style="WIDTH: 100%" align=right><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV></DIV>
<DIV><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>SIGNATURES</STRONG></FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=center>&nbsp;</DIV>
<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
duly caused this report to be signed on its behalf by the undersigned hereunto
duly authorized.</FONT></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left>
<DIV>
<TABLE cellSpacing=0 cellPadding=0 width="100%" align=center bgColor=#ffffff
border=0>
  <TR vAlign=top bgColor=#ffffff>
    <TD width="50%"><FONT face="Times New Roman" size=2>&nbsp;</FONT></TD>
    <TD width="1%"><FONT face="Times New Roman" size=2>&nbsp;</FONT></TD>
    <TD width="49%"><FONT face="Times New Roman" size=2>&nbsp;</FONT></TD></TR>
  <TR vAlign=top bgColor=#ffffff>
    <TD><FONT face="Times New Roman" size=2>&nbsp;</FONT></TD>
    <TD colSpan=2><FONT face="Times New Roman" size=2><STRONG>RITA MEDICAL
      SYSTEMS, INC.</STRONG></FONT></TD></TR>
  <TR vAlign=top bgColor=#ffffff>
    <TD><FONT face="Times New Roman" size=2>&nbsp;<BR>&nbsp;</FONT></TD>
    <TD><FONT face="Times New Roman" size=2>&nbsp;<BR>&nbsp;</FONT></TD>
    <TD><FONT face="Times New Roman" size=2>&nbsp;<BR>&nbsp;</FONT></TD></TR>
  <TR vAlign=top bgColor=#ffffff>
    <TD><FONT face="Times New Roman" size=2>Date:&nbsp;May 24, 2005</FONT></TD>
    <TD><FONT face="Times New Roman" size=2>By:&nbsp;&nbsp;</FONT></TD>
    <TD><FONT face="Times New Roman" size=2>/s/&nbsp;Joseph
DeVivo</FONT></TD></TR>
  <TR vAlign=top bgColor=#ffffff>
    <TD colSpan=2><FONT face="Times New Roman" size=1>&nbsp;</FONT></TD>
    <TD align=left>
      <HR align=left width="80%" color=#000000 noShade SIZE=2>
    </TD></TR>
  <TR vAlign=top bgColor=#ffffff>
    <TD colSpan=2><FONT face="Times New Roman" size=2>&nbsp;</FONT></TD>
    <TD>
      <DIV><FONT face="Times New Roman" size=2>Joseph DeVivo</FONT></DIV>
      <DIV><FONT size=2>President and Chief Executive
Officer</FONT></DIV></TD></TR></TABLE></DIV><BR></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR></DIV>
<DIV><BR></DIV>
<DIV id=PGBRK style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
<DIV id=FTR>
<DIV id=GLFTR style="WIDTH: 100%" align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV>
<DIV id=PN style="PAGE-BREAK-AFTER: always">
<DIV style="WIDTH: 100%; TEXT-ALIGN: center"><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt" face="Times New Roman"></FONT></DIV>
<DIV style="WIDTH: 100%; TEXT-ALIGN: center">
<HR color=#000000 noShade SIZE=2>
</DIV></DIV>
<DIV id=HDR>
<DIV id=GLHDR style="WIDTH: 100%" align=right><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV></DIV>
<DIV><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>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>
<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=left><BR></DIV>
<DIV>
<TABLE cellSpacing=0 cellPadding=0 width="100%">
  <TR>
    <TD style="BORDER-BOTTOM: #000000 thin solid" vAlign=top align=middle
    width="15%">
      <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">Exhibit
      Number</FONT></DIV></TD>
    <TD style="BORDER-BOTTOM: #ffffff solid" width="2%">&nbsp;</TD>
    <TD style="BORDER-BOTTOM: #000000 thin solid" vAlign=top align=middle
    width="66%">
      <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">Description</FONT></DIV></TD></TR>
  <TR bgColor=#ffffff>
    <TD vAlign=top align=left width="15%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD vAlign=top align=left width="66%">&nbsp;</TD></TR>
  <TR bgColor=#ccffcc>
    <TD vAlign=top align=middle width="15%">
      <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">10.88</FONT></DIV></TD>
    <TD width="2%">&nbsp;</TD>
    <TD vAlign=top align=left width="66%">
      <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">Separation
      Agreement and Mutual Release, dated May 19, 2005, between RITA Medical
      Systems, Inc. and Donald Stewart</FONT></DIV></TD></TR>
  <TR bgColor=#ffffff>
    <TD vAlign=top align=middle width="15%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD vAlign=top align=left width="66%">&nbsp;</TD></TR>
  <TR bgColor=#ccffcc>
    <TD vAlign=top align=middle width="15%">
      <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">99.1</FONT></DIV></TD>
    <TD width="2%">&nbsp;</TD>
    <TD vAlign=top align=left width="66%">
      <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 May 24,
2005</FONT></DIV></TD></TR></TABLE></DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left>&nbsp;</DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left>&nbsp;</DIV>
<DIV
style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt"
align=left><BR>&nbsp;</DIV>
<DIV></DIV>
<DIV id=PGBRK style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
<DIV id=FTR>
<DIV id=GLFTR style="WIDTH: 100%" align=left><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV>
<DIV style="WIDTH: 100%; TEXT-ALIGN: center"><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt" face="Times New Roman"></FONT></DIV>
<DIV style="WIDTH: 100%; TEXT-ALIGN: center">
<HR color=#000000 noShade SIZE=2>
</DIV></DIV>
<DIV id=HDR>
<DIV id=GLHDR style="WIDTH: 100%" align=right><FONT
style="DISPLAY: inline; FONT-SIZE: 8pt; COLOR: #000000; FONT-FAMILY: Times New Roman"></FONT></DIV></DIV>
<DIV></DIV>
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</HTML>
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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):
May 19, 2005
RITA
Medical Systems, Inc.
(Exact
name of registrant as specified in its charter)
000-30959
(Commission
File Number)
California
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
1.01
Entry
into a Material Definitive Agreement
On May
19, 2005, RITA Medical Systems, Inc. (the "Company") entered into a
separation agreement and mutual release with Donald Stewart. The agreement is
described more fully in Item 5.02 below, which description is incorporated into
this Item 1.01 in its entirety.
Item
5.02
Departures
of Directors or Principal Officers; Election of Directors;
Appointment
of Principal Officers.
On May
24, 2005, the Company issued a press release, attached as Exhibit 99.1 to this
Form 8-K, announcing that Donald Stewart, Chief Financial Officer and Vice
President, Finance and Administration of the Company, will be leaving the
Company to pursue other business interests once a new Chief Financial Officer
for the Company is hired. The Company also announced that Mr. Stewart will
remain actively involved as the Company's Chief Financial Officer during the
recruiting and transition periods.
In
connection with Mr. Stewart's planned departure, the Company and Mr. Stewart
entered into a Separation Agreement and Mutual Release with the Company (the
"Agreement"). The Agreement provides, among other things, that (i) Mr. Stewart
shall resign as Chief Financial Officer and Vice President, Finance and
Administration of the Company and terminate his employment with the Company on
the earlier of October 19, 2005 or such date as determined by the Board of
Directors of the Company (the "Separation Date"), (ii) the Company shall pay Mr.
Stewart his annual base salary of $205,000 for a six month period beginning
immediately following the Separation Date, (iii) the Company shall pay Mr.
Stewart a retention bonus of $30,000 unless Mr. Stewart voluntarily resigns his
employment with the Company prior to the Separation Date, (iv) the Company shall
pay Mr. Stewart's health insurance premiums for a six month period beginning
immediately following the Separation Date, and (v) all of Mr. Stewart's options
to purchase shares of the Company's common stock shall be fully vested and
exercisable until the later of the expiration date set forth in the applicable
option agreement and December 31, 2005. In the Agreement, the Company and Mr.
Stewart release one another from all claims that each has or may have against
the other. Mr. Stewart has until May 26, 2005 to revoke the Agreement. The
Agreement is attached as Exhibit 10.88 to this Form 8-K.
Item
9.01
Financial
Statements and Exhibits.
(c)
Exhibits:
10.88
Separation
      Agreement and Mutual Release, dated May 19, 2005, between RITA Medical
      Systems, Inc. and Donald Stewart
99.1
Press
      Release of RITA Medical Systems, Inc. dated May 24,
2005
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: May 24, 2005
By:
/s/ Joseph
DeVivo
Joseph DeVivo
President and Chief Executive
Officer
RITA
MEDICAL SYSTEMS, INC.
INDEX
TO EXHIBITS
Exhibit
      Number
Description
10.88
Separation
      Agreement and Mutual Release, dated May 19, 2005, between RITA Medical
      Systems, Inc. and Donald Stewart
99.1
Press
      Release of RITA Medical Systems, Inc. dated May 24,
2005