An unusual cause of acute renal failure: bilateral ureteral obstruction due to Candida tropicalis fungus balls.

Fungus balls have rarely been implicated as a cause of urinary tract obstruction. Approximately 50 cases of fungus balls of the urinary tract have been reported previously; the majority of cases were characterized by unilateral ureteral involvement or bladder involvement, and Candida albicans has been the organism most frequently isolated. We report, to our knowledge, the first case of bilateral ureteral obstruction caused by Candida tropicalis fungus balls.