*2.3.2.2 Type B*

According to the portal vein branches and the dominant areas, the liver was divided into nine segments for type B. A total of 203 (26.75%) cases were type B. Segments I to IV are similar to that of type A.

**Figure 3.**

*(a) Branches of the right anterior portal vein and the liver segments supplied by them for type A. (b) Branches of the right posterior portal vein and the liver segments supplied by them for type A.*

The right portal vein divides into the right anterior and the right posterior branches. Segments V, VIII, and IX are the areas supplied by the three main branches of the right anterior branch: the caudal (portal branches of segment V, P5), dorsal (portal branches of segment VIII, P8), and ventral branches (portal branches of segment IX, P9), respectively (**Figure 4a**). Segments VI and VII are the areas supplied by the fourth-level portal vein derived from the outer inferior and superior aspects of the right liver, respectively, of the right posterior branch (**Figure 4b**).
