An unusual complication of suprapubic catheterization with Cystofix: catheter knotting within the bladder.

Cystofix is commonly used to drain urine temporarily from the bladder. Common complications are hematuria, bladder wall edema and bladder spasm due to irritation by the catheter itself. A case is described where a Cystofix catheter became curled and knotted inside the bladder, probably due to deep introduction or increased detrussor contraction occurring with the irritation of the bladder wall.