Cap polyposis: a rare colorectal disease

Abstract

Results Initially, in several endoscopic sessions a complete polypectomy was intended. Since the disease was only temporarily responsive to antiphlogistics and abdominal symptoms worsened, a left hemicolectomy including part of the rectum had to be performed. Examination of the resected gut and of biopsies showed typical histological features of cap polyposis: sessile polyps with elongated crypts and a granulation tissue 'cap' near to the surface of the partly ulcerated mucosa. The epithelium of the crypts had saw-tooth configurations like in hyperplastic polyps without evidence of adenomatous changes. In the lamina propria signs of fibromuscular obliteration were found: moderate hyperplasia of smooth muscle fibers and mild fibrosis. Between the polyps the mucosa was normal.