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Fig. 2B. —54-year-old man with history of appendectomy, aortic surgery, and previous laparotomy for adhesive bands. Unenhanced CT scan reveals fluid in mesentery around congested veins (m). Note pseudothickening of bowel wall (arrowheads) caused by transverse scanning of Kerckring's folds. Gas bubbles in intestinal lumen (arrow) must not be confused with pneumatosis. Also note large amount of fluid in pelvis. Patient, who was immediately treated by nasogastric suction and fully recovered without surgery, was one of nine false-positive cases in our series.