Figure 2. 52-year-old man with metastatic renal cell carcinoma. (a) CT scan of chest shows 5 cm pulmonary metastasis in the left upper lobe (LUL). (b) CT scan obtained during radiofrequency (RF) ablation shows dorsosuperior position of the electrode within the mass. (c) CT scan obtained during RF ablation shows anterosuperior position of the electrode within the mass. (d) CT scan obtained during RF ablation shows inferior position of the electrode within the mass. (e) CT scan obtained 1 month after RF ablation showing surrounding contrast enhancing rim (white arrows).