Retroperitoneoscopic Vascular Hitch Procedure for Pelvi-Ureteric Junction Obstruction in Children-The Southampton Experience.

Purpose: There has been a longstanding debate regarding whether lower pole renal crossing vessels on the pelvi-ureteric junction preclude the need for a dismembered pyeloplasty. A retroperitoneoscopic technique for a transposition of these vessels has not yet been described in the literature. We report our early experience of the retroperitoneoscopic vascular hitch procedure for transposition of lower pole renal crossing vessels, including technique and outcomes. Methods: Single-center retrospective review of all children who had a retroperitoneoscopic vascular hitch procedure for pelvi-ureteric junction obstruction from March 2022 to April 2024. Data on symptom resolution, change in sonographic anterior-posterior diameter (APD), MAG-3 (mercaptoacetyltriglycine) renogram curves, postoperative length of stay, complications, and further surgical interventions were collected. Results are reported as median and interquartile range. Results: Ten patients (70% male, median age 11.7 years, range 8-13 years) with preoperative APD of 34 mm (23-40) over the 2-year period were included. One patient received an on-table diuretic stress test. Seven out of 10 patients had day-case surgery, and 3 patients had an overnight stay. The follow-up period was 343 days (122-456). Postoperative APD was 13 mm (6-23), and the change in APD was -18 mm (-25 to -10). No loss of function or uptake areas on MAG-3 scans were observed. Two patients received antibiotics for a presumed urinary tract infection in the postoperative period. Symptom resolution was achieved in 90% of patients, and 1 patient underwent robotic-assisted dismembered pyeloplasty 10 months later. Conclusion: Retroperitoneoscopic vascular hitch for lower pole renal crossing vessels is an acceptable alternative to dismembered pyeloplasty in selected pediatric cases.