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Fig. 3B. —67-year-old woman with moderately differentiated hepatocellular carcinoma within well-differentiated hepatocellular carcinoma in right hepatic lobe. Lesion-to-liver vascular ratios are as follows: for outer ring, cumulative artery ratio = 1.21, hepatic artery ratio = 0.69, portal vein ratio = 0.79; for inner nodule, cumulative artery ratio = 1.63, hepatic artery ratio = 0, portal vein ratio = 0. CT scan obtained during arterioportography shows outer ring is isoattenuating and inner nodule is hypoattenuating. On basis of enhancement patterns of CT hepatic arteriography and CT during arterioportography, outer ring and inner nodule are classified as groups 2 and 5, respectively.

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