Fig. 3

Surgical procedure: stapling the oral side of the tumor. a The tumor was located on the posterior wall of the upper body of the stomach by using an IR laparoscope camera. b, c The tumor in the posterior wall was fixed in the lesser curvature by rotating the stomach clockwise (yellow arrow). d First stapling. A 60-mm stapler was used from the lesser curvature side to ensure a 2-cm margin