Change:  ? portomesenteric vein gas unknown history •Portomesenteric vein gas is most commonly caused by mesenteric ischemia but may have a variety of other causes. •When CT demonstrates portomesenteric vein gas and clinical findings suggest the presence of mesenteric ischemia, surgery is mandatory Where hepatic venous gas   View changes from previous version. (Word count: 976)

Change: arrow). It is not clear whether this appearance is due to intra-mural gas, or properitoneal fat interposed between the descending colon and abdominal wall. Patient has known Crohn's disease Appearances are consistent with toxic megacolon Case 2 Dilated stomach with abnormal wall pattern (effaced). Intra-mural gas seen   View changes from previous version. (Word count: 976)

Change:  The black arrow identifies what is probably fat within the gall-bladder bed. The white outline arrow identifies what may be portal venous gas. This is a magnified view of the supine abdominal plain film. In addition to the hepatic-potal venous gas (white arrows) is evidence of intramural gas (black arrows)   View changes from previous version. (Word count: 950)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 905)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 772)

Change:  seen demonstrated in the transverse colon. Ulcerative colitis is the most common cause of toxic megacolon. The characteristic features of toxic megacolon are acute dilation of a segment of colon, florid inflammation of   View changes from previous version. (Word count: 772)

Change: Renamed from The Abdominal Plain Film- Intra-mural Gas by M.J.Fuller Apr 8 2008, 10:12 PM EDT for: Rename

Change: Renamed from The Abdominal Plain Film- Mural Gas by M.J.Fuller Apr 8 2008, 10:11 PM EDT for: Rename

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 757)

Change: arrow), separate from bowel contents. Immediately above the left iliac crest, there are two two biconcave triangles of gas density. These extend above to a line of gas gas that is (left) lateral and separate from the line of intramural gas. gas. Gas is seen on   View changes from previous version. (Word count: 724)