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Fig. 6A. —51-year-old man with metastatic colorectal cancer. CT portograms show right portal vein trifurcates into right anterior portal vein (arrow, B) and segment VI (curved arrow, C) and segment VII (straight arrow, C) branches. Left portal vein is denoted by arrow in A. This anatomy is surgically relevant to left trisegmentectomy, in which damage to either right posterior segment branch would leave patient with single-segment remnant liver.