Crossing Vessels in Retroperitoneal Laparoscopic Pyeloplasty: Anatomy and Outcomes

Area of Science:

• Urology
• Minimally Invasive Surgery
• Vascular Anatomy

Background:

• Crossing vessels are frequently observed during pyeloplasty for ureteropelvic junction obstruction (UPJO).
• These vessels can impact surgical planning and outcomes in UPJO repair.

Purpose of the Study:

• To detail the anatomical distribution of crossing vessels during retroperitoneal laparoscopic pyeloplasty (RLP).
• To outline management strategies for these vessels.
• To report long-term outcomes of RLP for UPJO.

Main Methods:

• Retrospective review of adult patients undergoing RLP for UPJO.
• Preoperative imaging (CT/MR urography) to assess vascular anatomy.
• Standardized surgical technique including vessel identification and management.

Main Results:

• Crossing vessels identified in 69.1% of 165 patients, commonly gonadal vein variants and accessory renal arteries.
• High overall success rate of 96.1% with a median follow-up of 64 months.
• Low complication rate (3% Clavien-Dindo grade III), with no routine need for ureteral transposition.

Conclusions:

• Systematic identification and management of crossing vessels in RLP lead to excellent long-term outcomes.
• Individualized treatment based on vessel type and relation to UPJ is crucial.
• Ureteral transposition is not routinely necessary in RLP for UPJO.