Abstract
We report two cases of diverticular colitis (DC) that subsequently progressed to ulcerative colitis (UC) after sigmoidectomy. The two patients underwent surgery because of either repeated diverticulitis or intractable bleeding. In case 1 (55-year-old male), colonoscopy revealed scattered reddish mucosa on crescentic folds, polypoid lesions and stenosis preoperatively. In case 2 (69-year-old female), preoperative colonoscopy and barium enema study depicted multiple diverticula and diffuse reddish granular mucosa resembling UC in the sigmoid colon, whereas no obvious inflammatory change was found in the rectum. Diarrhea and hematochezia occurred in both patients 28 and 13 months after the surgery, respectively, resulting in confirmation of typical UC. Careful follow-up is necessary in patients with DC considering that DC has a potential to develop into typical UC.
