Anuria due to bilateral ureteral obstruction by Aspergillus flavus in an adult male.

Mycelial clumps or bezoars (fungus balls) as a cause of upper urinary tract obstruction are rare, with fewer than 60 cases previously reported. Anuria due to bilateral ureteral obstruction with mycelial clumps is most rare. We report a man with bilateral ureteral obstruction by Aspergillus flavus and describe his diagnosis and treatment.