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Updated: Jul 6, 2026

Transmesenteric Laparoscopic Pyeloplasty in Trendelenburg Position for Horseshoe Kidney with Hydronephrosis
Published on: July 8, 2025
Insertion of an internal-external nephroureteral stent during pediatric laparoscopic pyeloplasty: description of the
Alessandro Taveres1, Numchai Manaboriboon, Armando J Lorenzo
1Division of Urology, The Hospital for Sick Children, Toronto, Ontario, Canada.
Objectives:
We present a technique for inserting an internal-external nephroureteral antegrade stent during a laparoscopic pyeloplasty.
Methods:
We describe the step-by-step technique for external-internal stent insertion during transperitoneal laparoscopic pyeloplasty: (1) Before completion of the ueretopelvic junction anastomosis, a 14-gauge angiocatheter is inserted and the external-internal stent is advanced under direct vision downward into the ureter. (2) A percutaneous access to the intrarenal collecting system is then performed by using another 14-gauge angiocatheter. (3) Once in the pelvis, a 1.9F stone basket is passed through the angiocath and the proximal arm of the stent is brought out through skin.
Conclusions:
The key advantage of this internal-external stent is that it can be removed in the clinic, thus not exposing the patient to another general anesthetic or cystoscopy for removal.
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