Prolapsing Mucosal Polyps without Prolapse of Rectal Mucosal Report of 7 Cases

matory lesions in the lower gastrointestinal tract including polyps, masses and ulcers that are characterized by elongated and distorted glands surrounded by proliferation of smooth muscle fibers from the muscularis mucosae. The term “prolapsing mucosal polyp” was first described by Franzin et al in 1985 as a new entity of benign colorectal polyp. They reported that these benign colonic lesions are characterized by the appearance of inflammatory polyps with mucosal prolapse. The common histological features include inflammatory granulation tissue in the lamina propria, proliferation of smooth muscle, and hyperplastic gland. Different terminologies such as inflammatory cloacogenic polyps, inflammatory cap polyps, and inflammatory myoglandular polyps, describing similar histological features of prolapsing mucosal polyps, have been reported in the literature. We have identified polyps with histological features as prolapsing mucosal polyps in patients without clinical evidence of rectal mucosal prolapse. In the present study, we examined and analyzed a series of seven cases with such lesions in hope of clarifying the clinicopathological features of this rare entity. J Soc Colon Rectal Surgeon (Taiwan) December 2007