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Fig. 2C. —45-year-old man with metastatic colorectal cancer. CT portograms show standard portal vein anatomy. Main portal vein divides into left portal vein (arrow, A) and right portal vein, which subsequently divides into right anterior portal vein (arrow, C) to supply segments V and VIII, and right posterior portal vein (arrow, D) to supply segments VI and VII. It is uncommon for all major branches to be seen on a single image, and being able to scroll through images on workstation or PACS is invaluable in correctly identifying and classifying variant anatomy. Multiplanar reconstruction may also overcome this limitation of 2D imaging.