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Fig. 2B. —Incomplete response of hepatocellular carcinoma after radiofrequency thermal ablation in 61-year-old woman. Contrast-enhanced axial epigastric harmonic power Doppler sonogram obtained after radiofrequency thermal ablation shows a small, circumscribed area of residual blood flow in the medial aspect of the tumor. Doppler spectral analysis of residual blood signal shows high-frequency pulsatile flow.