adio frequency ablation is an effective treatment for focal renal cell carcinoma (RCC).1,2 We report a patient with RCC in a transplanted kidney that was successfully treated with percutaneous sonographically guided radio frequency ablation.Received June 11, 2002,
Case ReportA 50-year-old man had a cadaveric renal transplant in 1975 after a failed living related renal transplant 1 year earlier. The donor organ was from a 20-year-old male trauma victim. For more than 24 years, the patient had excellent renal allograft function, with a serum creatinine level ranging between 0.9 and 1.1 mg/dL (reference range, 0.89-1.2 mg/dL). In 1999, the patient's serum creatinine level began to increase gradually to 1.5 mg/dL. Also, his creatinine clearance rate declined from 109 mL/min per 1.73 m 2 in 1997 to 54 ml/min per 1.73 m 2 in 2001. During this period, he had myocardial infarction and several episodes of congestive heart failure. Despite coronary angioplasty and stenting, the patient still had baseline exertional angina and poor cardiac output.At our institution, initial evaluation of the allograft included a renal sonographic examination that showed renal artery stenosis and a 2.2-cm solid renal mass indicative of RCC (Fig. 1). The mass was further confirmed with contrast-enhanced magnetic resonance imaging (MRI; Fig. 2). The MRI and sonographic examinations showed no evidence of metastatic disease. Because of the need for tissue diagnosis, percutaneous