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Fig. 1B. 67-year-old man with low-grade dysplastic nodules in right
hepatic lobe. Lesion-to-liver vascular ratios were as follows: for larger
nodule, cumulative artery ratio = 0.88, hepatic artery ratio = 0.7, portal
vein ratio = 0.82; for smaller nodule, cumulative artery ratio = 1.71, hepatic
artery ratio = 1.14, portal vein ratio = 0.84. CT scan obtained during
arterial portography shows both lesions seen in A are isoattenuating
compared with surrounding hepatic parenchyma. On basis of enhancement patterns
of CT hepatic arteriography and CT during arterioportography, both are
classified as group 2.