[A case of acute renal failure due to parapelvic cyst in a solitary kidney].

A 79-year female patient had undergone right radical nephrectomy for renal cell carcinoma (pT3b, grade 1) in October 2000. Three years later, she complained of left back pain and anuria. The ultrasonography and computed tomographic scanning showed a left hydronephrosis and parapelvic cyst. It was thought that the postrenal renal failure was caused by parapelvic cyst in a solitary kidney. An indwelling ureteral stent was placed for temporary relief of obstruction. Percutaneous cyst puncture was performed. Thereafter, she has been well, with no recurrent ureteral obstruction. To our knowledge, this is the third case of acute renal failure due to parapelvic cyst in a solitary kidney reported in the literature in Japan.