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Figure 18a: Ischemic colitis in an 81-year-old woman with myocardial infarction. (a) Anteroposterior CT scout view shows air (arrows) in wall of right colon and small- and large-bowel dilatation. (b) Transverse CT image demonstrates air (arrowheads) in wall of right colon, with lack of wall enhancement and pericolonic stranding indicative of infarction.