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Fig. 8B. —Portal venous anatomy in potential liver donor, 31-year-old man. Axial images were obtained during portal venous phase. Coronal maximum-intensity-projection CT image reveals contrast medium opacification of main portal vein (M) and its branches. Note posterior right portal vein (arrow) arising directly from main portal vein, an anatomic portal vein variant that some surgeons may deem a contraindication to performing donor right hepatectomy because of increased risk of postoperative portal vein thrombosis.