Fig. 2

Evaluation of the proximal and distal basin margins according to circumferential location of the tumor. When the tumor was located at the anterior or posterior wall (A), the reference point was defined at the lesser or greater curvature site that was closest to the tumor, respectively. The lengths between the proximal/distal basin margin and reference point at the lesser/greater curvature were measured. When the tumor was located at the lesser curvature (B), the reference point was the center of the tumor. The lengths between the proximal/distal basin margin and reference point at the lesser curvature were measured. If the sentinel basin was not identified at the greater curvature side, we did not measure the length between the proximal/distal basin margin and the reference point at the greater curvature. When the tumor was located at the greater curvature (C), the reference point was the center of the tumor. The lengths between the proximal/distal basin margin and reference point at the greater curvature were measured. If the sentinel basin was not identified at the lesser curvature side, we did not measure the length between the proximal/distal basin margin and the reference point at the lesser curvature. When the tumor was located at the posterior wall and difficult to localize after immediate tracer injection, the tumor location was predicted after partial omentectomy with dissection of the greater curvature (D). Otherwise, we re-confirmed the tumor location with intraoperative endoscopy, if possible DBM = distal basin margin; PBM = proximal basin margin; RP = reference point