[Intravesical knot of Foley catheter: unusual complication of cystourethrography in children].

We report a rare complication of knotting of the urethral catheter inside the urinary bladder of a 3 month old boy who was referred for voiding cystourethrogram. After unsuccessful attempts to remove the catheter, the baby was admitted to surgery. The catheter was removed under anesthesia after gentle but sustained traction. The complications of improper urethral catheterization are described and recommendations are made for their prevention.