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Colonic gallstone ileus. Gallstone ileus is a rare aetiology of bowel obstruction and very infrequently occurs in the colon. Typically, colonic gallstone ileus carries a high morbidity and mortality and requires surgery. This case report describes a cholecystocolonic fistula in a patient with ulcerative colitis with resulting colonic gallstone ileus, which was successfully intervened on via an endoscopic approach.