Special attention must be given to taking down the hilar plate, followed by carefully mobilizing the left hepatic duct, the left hepatic artery, and the left branch of the portal vein from the undersurface of the overlying liver. These vessels enter the liver at the base of the umbilical fissure. After the vessels and other structures are gently dissected away from the liver, an area is exposed for the incision between the medial and lateral segments of the left lobe of the liver (Figure 6). The bridge of hepatic parenchyma across the umbilical fissure does not contain a major vascular structure and can be divided with electrocautery. Branches to Segment 4 from the left portal vein can be individually controlled along the right border of the round ligament as it traverses the umbilical fissure.