FIGURE 2. Schematic illustrations (anteroposterior view) of complete dissection of the umbilical plate. A, All of the small portal branches arising from the cranial side of the umbilical portion (P4 days) are divided. B, The umbilical portion (UP) of the left portal vein is isolated from the umbilical plate. Three lines indicate resection line of left-side bile ducts in right hepatectomy (arrow X), conventional right hepatic trisectionectomy (arrow Y), and anatomic right hepatic trisectionectomy (line Z). The number indicates the segmental bile duct (B) and portal branch (P) according to Couinaud's hepatic segment.