title: Left-sided stenosing lesions in colonoscopy.
abstract: Of 2625 consecutive colonoscopic examinations, 122 stenotic lesions interfered with endoscopy. The sigmoid was the most frequent site of stenosis (64%). Of the two types of endoscopic patterns, type A, in which there is an intraluminal protruding mass, is the most frequent, and type B, in which a segment of colon gradually narrows, has intact mucosa. Adenocarcinoma was the most frequent cause of type A (83%), and complications related to diverticular disease (32%) and adenocarcinoma (27%) were most often associated with type B. Colonoscopy, guided multiple biopsies, and brushing cytology gave high diagnostic accuracy for type A lesions. In type B cases, brushings were usually negative.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis; D000328:Adult; D000368:Aged; D003108:Colonic Diseases / Q000175:diagnosis; D003110:Colonic Neoplasms / Q000175:diagnosis* / Q000473:pathology; D003113:Colonoscopy; D003251:Constriction, Pathologic / Q000175:diagnosis; D004241:Diverticulum, Colon / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012002:Rectal Diseases / Q000175:diagnosis; D012811:Sigmoid Neoplasms / Q000175:diagnosis*