Acute ulcerative colitis mimicking an obstructing carcinoma of the colon.
D000208:Acute Disease; D003093:Colitis, Ulcerative / Q000175:diagnosis*; D012809:Colon, Sigmoid; D003108:Colonic Diseases / Q000209:etiology; D003110:Colonic Neoplasms / Q000150:complications / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D007415:Intestinal Obstruction / Q000209:etiology; D007417:Intestinal Polyps / Q000150:complications; D008297:Male; D008875:Middle Aged