Intussusception due to a Muco-submucosal Elongated Polyp in the Small Intestine—A Case Report—

Abstract

A muco-submucosal elongated polyp (MSEP) is a benign, elongated, stalked polyp composed of normal mucosa and edematous connective tissue in the submucosal layer. An 89-year-old woman presented with a chief complaint of hematochezia. She was seen at our department because intussusception of the small intestine was suspected on contrast-enhanced computed tomography (CT). Abdominal CT showed a target sign with a contrast-enhanced mass in the small intestine, and small intestinal intussusception was diagnosed. Laparoscopic partial resection of the small intestine was performed. The resected specimen showed a 60×25 mm stalked mass with some erosions at the surface, but without surface irregularities. On histopathological examination, the surface of the mass was covered with normal intestinal mucosa, and the submucosal layer was composed of adipose tissue and sparse connective tissue with dilated venous and lymphatic vessels. Although MSEP develops frequently in the large intestine, there have been few reports of MSEP in the small intestine. It should be kept in mind in the differential diagnosis of small intestinal tumors that cause intussusception.