Case was a male in his 60s. Colonoscopy revealed a submucosal tumor 5 mm in size in the transverse colon, and a Neuroendocrine tumor was suspected, and ESD was performed. Histopathological examination revealed a granuloma with caseous necrosis in the center. A nematode-like structure was found in the necrotic tissue, and anisakiasis was suspected. Cases of colon anisakiasis are rare and there is no report treated with ESD in Japan. We report a case of colon anisakiasis which was diagnosed and treated with ESD.
