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Fig. 5B. —77-year-old man with hypervascular hepatocellular carcinoma in posterior segment of right lobe of liver. Mass shows washout of contrast material and isoattenuation compared with peripheral liver parenchyma on transverse late arterial phase CT scan. Note that right hepatic vein (arrow) is clearly enhanced; scanning may be too late. Hyperattenuating tumor capsule (arrowheads), which is enhancing during process of washout of contrast material from mass to peripheral liver parenchyma, may be retrospectively identified.