Endoscopic submucosal dissection for a large cecal adenoma covering an appendiceal orifice after appendectomy.

Competing Interests: T. Kanesaka has received lecture honoraria from Olympus Corporation, AI Medical Service Inc., and AstraZeneca. R. Ishihara has received lecture honoraria from Olympus Corporation, FUJIFILM Medical Co., Ltd., Daiichi Sankyo Co., Ltd., Miyaras Pharmaceutical Co., Ltd., AI Medical Service Inc., AstraZeneca, MSD, and Ono Pharmaceutical Co., Ltd. Y. Asada, T. Michida, H. Satomi, and K. Honma declare that they have no conflict of interest.