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Fig. 2B. —70-year-old man with hepatocellular carcinoma. CT hepatic arteriogram obtained after intraarterial prostaglandin E₁ injection shows 15-mm-diameter tumor (arrow). Tumor is visualized to greater extent and with more dense enhancement than without prostaglandin E₁. CT attenuation of tumor enhancement on CT hepatic arteriography after prostaglandin E₁ injection is 251 H.