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Fig. 3A. —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 CT scan during hepatic arteriography shows high-attenuation area in posterior superior segment (arrow). Digital subtraction angiogram obtained via right hepatic artery showed faint tumor stain.