Figure 8a.

CT and US images in a 63-year-old male patient with RCC. (a) Axial contrast-enhanced nephrographic phase CT image shows a 2.9-cm posterior exophytic RCC (arrow) that was confirmed at biopsy. The lesion was targeted for microwave ablation by using a single 17-gauge gas-cooled microwave antenna with US guidance. (b) Transverse US image during a 3-minute ablation with 90 W shows complete replacement of the tumor by hyperechoic gas bubbles (arrow). (c) Axial contrast-enhanced nephrographic phase postablation CT image shows complete ablation of the lesion, with an adequate ablative margin (arrows). Note the nonenhancing “tumor ghost” in the ablation zone (arrowhead).