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Updated: Jun 9, 2026

Transmesenteric Laparoscopic Pyeloplasty in Trendelenburg Position for Horseshoe Kidney with Hydronephrosis
Published on: July 8, 2025
Long-term functional and morphological outcome after pyeloplasty for huge renal pelvis
Osama Sarhan1, Tamer Helmy1, Mohamed Abou-El Ghar1
1Urology and Nephrology Center, Faculty of Medicine, Mansoura University, Mansoura, Egypt.
Insights
Open pyeloplasty is a successful treatment for ureteropelvic junction obstruction (UPJO) with a huge renal pelvis, achieving a 91% success rate. While hydronephrosis may persist radiologically, functional outcomes are generally positive.
Area of Science:
- Urology
- Pediatric Surgery
- Surgical Outcomes
Background:
- Ureteropelvic junction obstruction (UPJO) can present with a significantly dilated renal pelvis.
- Evaluating surgical outcomes in UPJO with a huge renal pelvis is crucial for patient management.
Purpose of the Study:
- To assess the functional and morphological results of open pyeloplasty in patients with UPJO and a huge renal pelvis.
Main Methods:
- Retrospective review of 41 patients who underwent open pyeloplasty for UPJO with a huge renal pelvis between 1998 and 2008.
- Evaluation of preoperative imaging, surgical details, and postoperative course, with follow-up for functional and morphological outcomes.
- Success defined by symptomatic relief and radiographic resolution of obstruction.
Main Results:
- The overall success rate for open pyeloplasty was 91% in this cohort.
- Improvement in hydronephrosis was observed in most patients, though 65% showed persistent obstruction on diuretic renography.
- No perioperative complications occurred; secondary procedures (redo pyeloplasty or nephrectomy) were rarely needed.
Conclusions:
- Open pyeloplasty is a feasible and highly successful surgical option for UPJO with a huge renal pelvis.
- Persistent hydronephrosis and radiological obstruction are not uncommon post-pyeloplasty but do not always correlate with poor functional outcomes.
- Nephrectomy is seldom required, even in cases with significant renal function deterioration.
Objective:
• To evaluate the functional and morphological outcome after open pyeloplasty for ureteropelvic junction obstruction (UPJO) with huge renal pelvis.
Patients And Methods:
• A retrospective review of all cases who underwent pyeloplasty for huge renal pelvis was conducted. • Records were evaluated with respect to age at presentation, preoperative imaging, surgical details and postoperative course. Patients were followed up regularly for both functional and morphological outcome. • Success was defined as both symptomatic relief and radiographic resolution of obstruction at last follow-up.
Results:
• Between 1998 and 2008, 526 cases of primary UPJO underwent open dismembered pyeloplasty at our centre. • Of these patients, 41 (8%) had UPJO with huge renal pelvis. • No perioperative complications were encountered in the study group. Mean (range) follow-up was 34 (18-84) months and nine patients were lost to follow-up. The overall success rate was 91%. • Two patients underwent redo pyeloplasty, whereas secondary nephrectomy was necessary in one. • Improvement of hydronephrosis was evident in all patients, except in three patients who underwent secondary procedures. • However, persistent obstruction on diuretic renography was seen in most cases (65%).
Conclusions:
• Open pyeloplasty for huge pelvis UPJO is feasible with a high success rate. • Varying degrees of hydronephrosis and radiological obstruction after pyeloplasty are not uncommon. • Nephrectomy is rarely indicated in cases with severely deteriorated renal function.
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Anatomical Position and Dimensions
The kidneys are retroperitoneal organs positioned against the posterior abdominal wall on either side of the spine, roughly between the twelfth thoracic and third lumbar vertebrae. Each kidney is typically 10-12 cm long, 5-6 cm wide, and 3-4 cm thick, weighing about 150 grams.
Renal Cortex
The outermost region of the kidney is the...
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