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Fig. 2 —Intrahepatic biliary duct branching patterns are divided into seven types. Aberrant ducts are indicated in gray. C = cystic duct, Acc = accessory duct. (Adapted with permission from [15])

A, Diagram shows type 1, conventional branching.

B, Diagram shows type 2, which is triple confluence of right anterior segmental duct draining segments V and VIII (RAS), right posterior segmental duct draining segments VI and VII (RPS), and left hepatic duct (LHD) into common hepatic duct (CHD).

C-E, Diagram shows types 3A, 3B, and 3C: RPS drains anomalously into LHD, CHD, or cystic duct, respectively.

F, Diagram shows type 4: Right hepatic duct (RHD) drains into cystic duct.

G and H, Diagram shows types 5A and 5B: Right accessory duct drains into CHD or RHD.

I, Diagram shows type 6: Segments II and III drain individually into RHD or CHD.