A 34-year-old woman with tuberous sclerosis presented with an increase of an abdominal mass and intermittent left flank pain on May 20, 1991. Computed tomography showed multiple bilateral renal masses with fatty density areas and a fatty density thrombus in the inferior vena cava, which extended through the right renal vein of the right kidney on ultrasonography. The inferior vena caval thrombus was also demonstrated by magnetic resonance imaging. Since marked deterioration of the right renal function was found on renography, right radical nephrectomy with thrombectomy was performed on July 2. Microscopically all tumors were identical with angiomyolipoma. She was discharged on Jury 20 and had been followed with good renal function at the outpatient clinic for more than 2 years. Follow up CT revealed no interval changes in the left renal masses.
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