A CASE OF COLONIC ADENOMA WITH MORPHOLOGICAL CHANGES BY AN ANISAKIS

Abstract

A 68-year-old man underwent colonoscopy to investigate his chief complaint of hematochezia. Colonoscopy revealed a laterally spreading tumor (LST) in the ascending colon and colon cancer in the rectum. One month later, colonoscopy prior to undergoing endoscopic submucosal dissection (ESD) of the LST revealed a morphological change of the LST to an elevated lesion and that an Anisakis penetrated the center of the LST. We attempted ESD, but fibrous tissue made dissection difficult. We performed laparoscopic ileocecal resection for the LST and rectectomy for rectal cancer. The histopathological diagnosis was an adenoma of the ascending colon with eosinophilic infiltration. We report a rare case of colonic adenoma with a change in morphology of the tumor by an Anisakis.