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Fig. 4C —"Blind spot" during laparoscopic cryoablation of
renal tumor in 67-year-old man. Intraoperative sonogram obtained later than
B in ablation shows that ice ball (arrows) has enlarged and
now involves all of visualized portions of RCC. However, because of extensive
posterior acoustic shadowing related to ice ball (asterisk),
posterior margin of ablation zone cannot be evaluated, resulting in
"blind spot."
