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Figure 9a. Marked involution of a central RCC in a 78-year-old man with only one kidney who had undergone RF ablation for life-threatening hematuria. (a) Coronal preablation single-shot fast SE T2-weighted MR image shows a small central mass (arrow). (b) Coronal single-shot fast SE T2-weighted MR image obtained 11 months after ablation shows marked involution of the tumor (arrow). This degree of involution is more typical of tumors treated with cryoablation.