Fig. 6.

72-year-old man with needle tract implantation after percutaneous radiofrequency ablation of hepatocellular carcinoma, with history of transcatheter arterial chemoembolization.

A-C. Contrast-enhanced CT images obtained on arterial (A), portal (B), and equilibrium (C) phases 13 months after percutaneous radiofrequency ablation using multitined expandable electrode for viable tumor within partial lipiodol-laden mass. Images show two small enhancing lesions (arrows) involving intercostal muscles along previous needle tract. Imaging findings were similar to needle tract implantation after biopsy and percutaneous ethanol injection therapy. Note subcapsular lipiodol-laden mass (arrowhead) with no residual viable tumor after percutaneous radiofrequency ablation.