Have you ever seen perforating ureter injury by C-arm?

Angled catheter and all other techniques were unavailable for this impacted ureter stone and ureter stricture.

You should stop the procedure and try antegrade approach at this time.

Preoperative CT scan

Ureter stone, LT kidney lower pole stone, kinded ureter, and severely hydronephrotic kidney and ureter

Preoperative KUB

Intraoperative C-arm image ****

You can see retroperitoneal space and contour of retrocolon.

Postoperative KUB

Antegrade approach and DJ insertion