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Fig. 2C. —65-year-old man with 3.2-cm hepatocellular carcinoma treated 4 months before study using radiofrequency ablation. Arterial phase CT scan obtained 1 day after sonographic study confirms presence of residual focus of enhancing viable tumor (arrow). This area was at lower margin of tumor, and hence corresponded in morphology, size, and location to region of tumor identified using pulse inversion sonography.