Fig. 1

a Macroscopic findings of the resected gastric lesion specimen at the time of the first surgery(1: proximal site, 2: distal site). The green line is the dividing line at the time of pathology specimen preparation. Poorly differentiated adenocarcinoma was identified in the area of the red line. Together with the macroscopic view, the area indicated by the arrow is presumed to be the tumor. b The lesion is located in the area indicated by the red line. Histologically, the lesion was extensively found along the submucosal layer (red line). The margins were negative