[BCG-therapy as a rare reason for postrenal failure].

History And Clinical Findings:  In the following case report, we describe a patient with acute renal failure due to an urinary congestion level II-III under BCG-(Bacillus Calmette-Guérin)-therapy because of bladder cancer. Cystoscopy revealed the diagnosis of BCG-induced intramural narrowing of distal ureters bilaterally.

Therapy And Further Development:  After receiving a double-J-catheter the renal function returned to normal.