title: Lymphoepithelioma-like carcinoma of the colon.
abstract: A 70-year-old female underwent follow-up colonoscopy after colonic polypectomy. The colonoscopy revealed the presence of a 7-mm submucosal tumor in the sigmoid colon. The tumor surface was smooth and covered with normal mucosa. It was diagnosed as a submucosal tumor, and polypectomy was performed. Histopathological examination of the resected specimen revealed moderately to poorly differentiated adenocarcinoma measuring 2 × 5 × 3 mm with marked peritumoral lymphocytic infiltration and lymphoid follicle formation. It was diagnosed as carcinoma with lymphoid stroma (lymphoepithelioma-like carcinoma), SM (1,800 μm), ly2, v0, budding; grade 1. We confirmed the indication for noncurative additional surgical resection and performed laparoscopic sigmoid colectomy. No metastases were observed in the dissected lymph nodes.
authors.affiliation: Department of Coloproctology, Tsujinaka Hospital Kashiwanoha, Chiba, Tokyo, Japan.
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Mori
authors.forename: Kazunari
authors.initials: K
authors.lastname: Akagi
authors.forename: Masaaki
authors.initials: M
authors.lastname: Yano
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sashiyama
authors.forename: Osamu
authors.initials: O
authors.lastname: Tsutsumi
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Hamahata
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Tsujinaka
authors.forename: Akihiko
authors.initials: A
authors.lastname: Tsuchida
authors.forename: Jun
authors.initials: J
authors.lastname: Matsubayashi
keywords: Adenocarcinoma; Colon cancer; Epstein-Barr virus; Lymphoepithelioma-like carcinoma; Lymphoid stroma