Figure 11b. Microwave ablation of a renal tumor in an 85-year-old woman. A solid renal mass of the right kidney was incidentally discovered at US performed for abdominal pain. (a) US scan of the right kidney shows a discrete mass 3.7 cm in greatest dimension (cursors). (b) CT fluoroscopic scan obtained with the patient prone shows a single microwave applicator within the mass. Two 10-minute ablations were performed. (c) Contrast-enhanced CT scan obtained at 4-month follow-up shows lack of enhancement in the mass (arrows).