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Fig. 6A. —48-year-old man with two hepatocellular carcinomas measuring 6.5 cm and 1.5 cm in segments V and VI. CT during arterial portography image shows 6.5-cm round area of portal perfusion defect (arrows). Note separate large irregular area of portal perfusion defect (arrowheads) containing small hepatocellular carcinoma. It is probably caused by portal vein obstruction or arterioportal shunt.