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Case Reports in Gastrointestinal Medicine
Volume 2015, Article ID 201042, 6 pages
Case Report

Focal Intramucosal Adenocarcinoma Occurring in Gastric Hyperplastic Polyps: Two Case Reports

1Department of Gastroenterology, Chikamori Hospital, Kochi 780-8522, Japan
2Department of Endoscopic Diagnostics and Therapeutics, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan

Received 26 May 2015; Accepted 15 July 2015

Academic Editor: Christoph Vogt

Copyright © 2015 Keisuke Taniuchi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Gastric hyperplastic polyps are generally considered benign lesions, although rare cases of adenocarcinoma have been reported. Two cases of intramucosal adenocarcinoma originating from gastric hyperplastic polyps that were successfully removed by endoscopic mucosal resection or endoscopic submucosal dissection are reported. On pathological examination, adenocarcinoma limited to the hyperplastic foveolar epithelial mucosa of the gastric hyperplastic polyps was observed.