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The radiology of the ileoanal reservoir based on a study of 50 consecutive patients is presented. Small-bowel obstruction (12%) and leakage at the ileoanal anastomosis (8%) were detected most commonly. Partial outlet obstruction from reservoirs fashioned from three segments of terminal ileum was noted radiographically as a common problem unique to this form of ileoanal reservoir. Superior mesenteric artery syndrome (6%), pelvic abscess (4%), pouch-vesicular fistula (2%), and several other problems were less frequent.