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Fig. 3D. —Percutaneous ethanol injection guided by CO₂-enhanced sonography in 52-year-old man with Child's class A cirrhosis [9] and hepatocellular carcinoma with small lesion not detected on conventional sonography. Contrast-enhanced helical CT scan performed after four sessions of percutaneous ethanol injection therapy shows necrotic area (arrow) that is larger than viable area depicted on CT during hepatic arteriography before treatment.