Transected guidewire tip simulating ureteral stone.

A 62-year-old woman was admitted with a diagnosis of a distal ureteral stone 2 years after antegrade imaging of the kidney. Ureteroscopy revealed a guidewire tip that transected during the antegrade study. The events leading to guidewire transection were reproduced, and a minor modification of current guidewires is suggested to prevent similar incidents.