Table 2. Scoring of mesograstium.

	0 point	0.5 point	1 point
“Tri-junction”	fail to find	not obvious	very obvious
“Pumpkin-like surface”	fail to expose	not obvious	very obvious
“Little square”	fail to expose	not obvious	very obvious
Root ligation	fail to reach the root part of blood vessels	not quite satisfied	quite satisfied
Bleeding amount	>40 ml	20–40 ml	<20 ml

Five parameters were chosen mainly to evaluate the integrity of mesogastrium during surgery. “Tri-junction” and “pumpkin-like surface” can represent the locating and good expose of gastric mesenteries; “little square” refers to the flat and smooth plane on the lower side after gastric mesenteries have been well dissected, and root ligation means the dissection has reached the exit part of envolope-like mesogastrium. These four parameters together reflect the integrity of mesogastrium during and after surgical dissection. Besides, the bleeding amount in the laparoscopic part of surgery can tell the quality of operation as well.