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Fig. 3C. —Complete response of hepatocellular carcinoma after repeated radiofrequency thermal ablation performed with contrast-enhanced power Doppler sonographic guidance in 65-year-old man. Contrast-enhanced helical CT scan obtained in arterial phase after first radiofrequency ablation shows large enhancing area of residual viable tumor in medial aspect of lesion (arrow), corresponding to enhancing portion on contrast-enhanced power Doppler sonogram (B).