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Fig. 1 —Portal vein branching patterns. RAS = right anterior segmental portal vein supplying segments V and VIII, RPS = right posterior segmental portal vein supplying segments VI and VII. (Adapted with permission from [13])

A-F, Diagrams show conventional branching (A); trifurcation (B), which is defined as simultaneous origin of RAS and RPS from main portal vein; RPS arising from main portal vein (C); RAS arising from left portal vein (D); complete absence of right portal vein (E); and absence of horizontal segment of left portal vein (F).