Figure 6.

Images of a 9 cm hepatocellular carcinoma (HCC) mass in a 76-year-old man with hepatitis C-related cirrhosis. Transverse CT scans obtained during the (a) precontrast, (b, c) late arterial, (d) portal venous, and (e) equilibrium phases demonstrate a hypervascular HCC in the right posterior segment of the liver. The lesion shows prominent hypoattenuation in the precontrast phase with a central necrotic portion and relatively early washout during the portal venous phase. Note the intratumoral heterogeneous enhancement (b, c) and disproportionally enlarged vessels (arrows in b and c) in the tumor, thus indicating focal aneurysmal dilatation. Pathology review of the explanted liver revealed a poorly differentiated HCC.