Problem of cancer in ulcerative colitis.
D003082:Colectomy; D003093:Colitis, Ulcerative / Q000150:complications* / Q000601:surgery; D003110:Colonic Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000517:prevention & control; D006801:Humans; D011351:Proctoscopy; D011379:Prognosis; D011859:Radiography