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Fig. 7B. —59-year-old man with metastatic colorectal cancer. CT
portograms show single patient in our series in whom portal vein variant
branch pattern involved left portal vein. In this patient, segment IV portal
vein (arrow, F) arose from right portal vein (straight
arrow, E) and not from left portal vein, which supplied only
lateral segment. Curved arrow (E) indicates segment VI portal vein
branch. If it is not recognized before procedure in a patient undergoing
portal vein embolization, segment IV branch could be inadvertently embolized
during right portal vein embolization or inadvertently not embolized during
left portal vein embolization.
