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Imaging-Guided Percutaneous Radiofrequency Ablation of Solid Renal Masses: Techniques and Outcomes of 38 Treatment Sessions in 32 Consecutive Patients

¹ All authors: Department of Diagnostic Imaging, Rhode Island Hospital, Brown Medical School, 593 Eddy St., Providence, RI 02903.

View larger version (171K): [in a new window]   Fig. 1A. —79-year-old woman with biopsy-proven renal cell carcinoma of right kidney. Contrast-enhanced CT scan obtained before treatment shows enhancing exophytic mass (arrow) along posterior medial border of right kidney.

View larger version (165K): [in a new window]   Fig. 1B. —79-year-old woman with biopsy-proven renal cell carcinoma of right kidney. CT image obtained 2 months after radiofrequency treatment shows decreased size of mass and no enhancement. Note mild dilatation of upper pole calyx (arrow), which is presumably due to heat-induced stricture of collecting system.

View larger version (125K): [in a new window]   Fig. 2A. —68-year-old man with solid enhancing mass in left kidney. Contrast-enhanced CT scan obtained before treatment shows enhancing exophytic mass (arrow) in lateral left kidney.

View larger version (155K): [in a new window]   Fig. 2B. —68-year-old man with solid enhancing mass in left kidney. CT fluoroscopic image obtained during treatment shows cluster electrode (arrow) along medial aspect of mass. Patient required three separate 6-min treatments of mass at separate locations during treatment session to cause complete necrosis.

View larger version (122K): [in a new window]   Fig. 2C. —68-year-old man with solid enhancing mass in left kidney. Contrast-enhanced CT scan obtained 1 month after radiofrequency treatment shows complete tumor necrosis with no enhancement.

View larger version (161K): [in a new window]   Fig. 3A. —74-year-old woman with biopsy-proven renal cell carcinoma requiring two radiofrequency treatments. Contrast-enhanced CT scan obtained before treatment shows enhancing exophytic mass (arrow) in posterior lower pole of right kidney.

View larger version (136K): [in a new window]   Fig. 3B. —74-year-old woman with biopsy-proven renal cell carcinoma requiring two radiofrequency treatments. CT fluoroscopic image from first radiofrequency ablation shows single electrode in medial portion of lesion.

View larger version (108K): [in a new window]   Fig. 3C. —74-year-old woman with biopsy-proven renal cell carcinoma requiring two radiofrequency treatments. Contrast-enhanced CT scan obtained 2 months after original radiofrequency ablation shows residual enhancing tumor (arrow).

View larger version (124K): [in a new window]   Fig. 3D. —74-year-old woman with biopsy-proven renal cell carcinoma requiring two radiofrequency treatments. Contrast-enhanced CT scan obtained 6 months after second radiofrequency treatment shows no residual enhancing tissue at site of tumor (arrow).

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