DUODENAL MUCO-SUBMUCOSAL ELONGATED POLYP WITH MARKED HYPERPLASIA OF ADIPOSE TISSUE

Abstract

A 70-year-old woman with type C liver cirrhosis was admitted to our hospital due to anemia and melena. Contrast-enhanced computed tomography revealed a 5cm-long tumor in the third part of the duodenum and a low-density area indicating the presence of adipose tissue in the tumor. Oral double-balloon endoscopy showed a 5cm-long pedunculated polyp in the third part of the duodenum. After endoscopic polypectomy, histological examination showed that the polyp was covered with normal duodenal mucosa and the mucosal and submucosal components contained loose connective tissues accompanied by venodilation and lymphangiectasia. Since these findings of the resected specimen were compatible with those of colonic muco-submucosal elongated polyp (CMSEP), we diagnosed the polyp as a duodenal MSEP. Duodenal MSEP is rare and this polyp was characterized by marked hyperplasia of adipose tissue within the lesion.