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Figure 21b.   CT evaluation of ethanol ablation of hepatocellular carcinoma. (a) CT scan obtained before ablation shows an encapsulated 7-cm hepatocellular carcinoma (arrow). (b) CT scan obtained 3 years after ethanol ablation shows that the tumor (arrow) has decreased markedly in size and shows no contrast enhancement. The tumor was treated by a single-session injection of 60 mL of ethanol.