Fig. 1.

Histological diagnosis of EGC. (A) A small depressed lesion is noticed on the posterior wall of upper gastric body. (B) Lesion without invasive finding is noticed on the biopsy, which is classified as dysplasia (Vienna classification 4.1.) in the West. In contrast, this lesion is classified as well differentiated adenocarcinoma (Vienna classification 4.2.) in Japan. (C) After the resection, submucosally invasive adenocarcinoma with lymphatic involvement (Vienna classification 5.2.) is diagnosed.