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Fig. 5 —Precise monitoring of percutaneous cryoablation of renal tumor in 62-year-old man. Unenhanced CT image obtained during percutaneous cryoablation of right-sided renal cell carcinoma. Because ice ball (white arrows) is so well visualized and can be closely monitored, cryoablation can be safely performed even when there are vulnerable adjacent structures such as colon (black arrow) as long as ice ball is not allowed to extend to colon.