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Stricture: (a) Single column barium enema in a 59-year-old man who underwent pelvic irradiation demonstrates a long segment irregular stricture of the rectosigmoid (long arrow). Also noted is a colocolic fistula (short arrow) which is another potential complication of radiation therapy. Barium enema in another patient with history of ischemic colitis demonstrates a short segment smooth stricture (arrow) at the junction of the sigmoid and descending colon (b).
