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Fig. 2D —Radiofrequency ablation technique for treatment of a renal cell carcinoma (RCC) in a 78-year-old woman with diabetes and chronic congestive heart disease. Contrast-enhanced CT image obtained at end of ablation session shows normal enhancement of kidney with no enhancement in treated area, which encompasses tumor. Small gas bubbles are seen in area of treatment, expected finding resulting from tissue boiling during ablation.