Ischemic colitis.Double-contrast barium enemas of a 44-year-old female patient with a sudden onset of severe abdominal pain and rectal bleeding. The first DCBE shows a 12cm segment of proximal descending colon which is persistently contracted and irregular in outline, but without any definite evidence of ulceration. The location close to the splenic flexure is typical of ischaemia, which represents a watershed between the middle colic territory of the superior mesenteric artery and the left colic territory of the inferior mesenteric artery.
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