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Fig. 2B. —69-year-old man with high-grade dysplastic nodule and moderately differentiated hepatocellular carcinoma in right hepatic lobe. Lesion-to-liver vascular ratios were as follows: for smaller nodule, cumulative artery ratio = 1.42, hepatic artery ratio = 0, portal vein ratio = 0; for larger nodule, cumulative artery ratio = 1.10, hepatic artery ratio = 0.80, portal vein ratio = 1.17. CT scan obtained during arterioportography shows smaller lesion (arrow) has portal perfusion defect and larger lesion appears isoattenuating. Smaller and larger nodules are classified as groups 5 and 2, respectively.

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