title: DIFFICULTY IN DISTINGUISHING COLITIS OF RECTUM AND CARCINOMA OF RECTUM.
mesh_terms: D000230:Adenocarcinoma; D003092:Colitis; D003093:Colitis, Ulcerative; D003937:Diagnosis, Differential; D005853:Geriatrics; D006801:Humans; D012004:Rectal Neoplasms; D012007:Rectum; D012812:Sigmoidoscopy
keywords: ADENOCARCINOMA; COLITIS, ULCERATIVE; DIAGNOSIS, DIFFERENTIAL; GERIATRICS; RECTAL NEOPLASMS; SIGMOIDOSCOPY