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Fig. 2C. —61-year-old man with percutaneous radiofrequency ablation of residual hepatocellular carcinoma. He had undergone transcatheter arterial chemoembolization for hepatocellular carcinoma. Contrast-enhanced CT scan obtained during equilibrium phase, 30 days after radiofrequency ablation, shows low-attenuating ablation zone with relatively thick, ringlike enhancement of inner and peripheral zones (arrowheads). This changing target appearance of rim (double ring at arterial phase and single ring at equilibrium phase) is characteristic finding of liver abscess.