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Fig. 1C. —71-year-old woman with hepatocellular carcinoma. CT hepatic arteriogram obtained after intraarterial prostaglandin E₁ injection shows round enhancement of tumor (arrow) that is 20 mm in diameter. CT attenuation of enhancement of this lesion is 353.0 H, whereas CT attenuation of corresponding area on CT hepatic arteriogram before prostaglandin E₁ injection was 91.0 H.