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Treatment effect monitoring by contrast-enhanced ultrasound after cryoablation of high-risk renal lesion. (A) 3.4-cm right renal lesion (arrow) with soft tissue enhancement concerning for renal cell carcinoma. (B) Gray-scale ultrasound of treated kidney. (C) Contrast-enhanced ultrasound of the same window showing treatment ablation cavity without nodular enhancement. Minimal peripheral enhancement suggestive of post-procedure scar. No viable tumor is present.
