Usefulness of a long sheath in ureteral catheterization after failure of antegrade ureteral stent placement using a short sheath.

Ureteral catheterization using a long sheath is feasible and effective when antegrade ureteral intervention using a short sheath fails. When using a long sheath, the technical success rate was higher when advancing the balloon catheter over the guidewire than when advancing the guidewire through tight stricture.