*2.3.2 II Dong's liver segmentation*

Type A is similar to Couinaud or Cho's segmentation, with the liver containing eight segments (365 cases, 48.09%). Type B contains nine segments because of the three branches of the right-anterior portal vein (203 cases, 26.75%). Type C (76 cases, 10.01%) has two variations, type C-a, wherein the right-posterior portal vein is sector-shaped and the right-anterior portal vein is similar to that in type A, and type C-b, wherein the rightposterior portal vein is sector-shaped and the right-anterior portal vein is similar to that in type B. Type D contains special portal vein variations that need three-dimensional simulation to design individualized liver resection plans (115 cases, 15.15%).
