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Fig. 2C. —52-year-old man with hepatocellular carcinoma. CT hepatic arteriogram after prostaglandin E₁ injection shows that size and shape of nontumorous enhanced area are unchanged, but attenuation is decreased despite repeated administration of contrast material. CT attenuation value of this enhancement decreased to 160 H on CT hepatic arteriography after prostaglandin E₁ injection.