Prolapsing Mucosal Polyps without Prolapse of Rectal Mucosal-Report of 7 Cases
摘要
Background. Prolapsing mucosal polyps were first described in 1985 as a new entity of benign colorectal polyp and were characterized by the association with mucosal prolapse. We examined and analyzed a series of seven cases with such lesions in hope of clarifying the clinicopathological features of this rare entity. Methods. From the Database of Pathology in Chang Gung Memorial Hospital from 2002 to 2005, we retrospectively identified and studied seven patients who had a colorectal polyp with a pathologic diagnosis of prolapsing mucosal polyp. Results. There were three male and four female patients. Their ages ranged from 30 to 86 years. All the polyps were located in the sigmoid colon or rectum. None of the patients had diverticular disease, solitary rectal ulcer syndrome, or symptoms of mucosal prolapse. The most consistent histological findings were: crypt abnormalities, fibromuscular obliteration of the lamina propria, splayed muscularis mucosae into lamina propria in the polyp, inflammatory cells infiltration in lamina propria and mucosal capillary abnormalities. Conclusions. Prolapsing mucosal polyp is a rare but histologically distinct type of colorectal polyp, which may be not associated with clinical evidence of rectal mucosal prolapse.