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Fig. 3D. —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 repeated radiofrequency ablation performed under contrast-enhanced power Doppler sonographic guidance shows lesion to have homogeneous hypoattenuation, suggesting complete response.