Malrotated Kidney Research Articles

VE08 Robotic assisted renal repositioning and pyeloplasty for malrotated kidney

VE08 Robotic assisted renal repositioning and pyeloplasty for malrotated kidney

Transperitoneal Laparoscopic Pyelolithotomy in Pelvic Ectopic Kidneys: Experience From a Northern Indian Tertiary Care Institution.

Introduction The ectopic pelvic kidneys have a higher likelihood of developing renal stones due to urinary stasis caused by the abnormal position of the renal pelvis, altered course of the ureter, and kidney malrotation. This retrospective study highlights the safety, efficacy, and feasibility of performing transperitoneal laparoscopic pyelolithotomy in cases of pelvic ectopic kidney. Methodology The 15 patients with ectopic pelvic kidneys and nephrolithiasis underwent laparoscopic pyelolithotomy. The kidney was exposed either by moving the bowel or using a trans-mesocolic approach. A surgical procedure was performed to remove stones from the renal pelvis using laparoscopic forceps. Following the placement of a double J stent, the incision in the renal pelvis was closed. The procedure was completed after the intraperitoneal drain was inserted. Results A total of 15 patients underwent the transperitoneal laparoscopic pyelolithotomy procedure, with a male-to-female ratio of 3:2. The average age of the patients was 41 (25-58) years, while the average size of the stones was 3.8 cm. Additionally, seven (46.6%) patients had the presence of caliceal stones in conjunction with the pelvic stone. Out of the 15 patients, some had stones on the left side (n = 9, 60%), while others had stones on the right side (n= 6, 40%). The operation with an average duration was 125 minutes with a range of (90-190). Fourteen (93.3%) patients were found to be free of stones. A patient required extracorporeal shock wave lithotripsy (ESWL) to address a small caliceal residual stone measuring 8 mm. After just one session of ESWL, this stone was completely cleared. All stones were successfully removed, resulting in a 100% stone-free rate. Conclusions Laparoscopic pyelolithotomy is a highly effective and efficient procedure for treating large and numerous stones in the ectopic pelvic kidney. This method has a significant level of efficiency in removing stones with limited consequences.

Kidney malrotation with aberrant renal arteries and extra-renal calyces - case report

Kidney malrotation with aberrant renal arteries and extra-renal calyces - case report

Laparoscopic strategies in complex upper urinary tract obstruction

We enumerate the various laparoscopic strategies to resolve upper urinary tract (UUT) obstruction in the context of variations in anatomy and report their outcomes. Retrospective review of primary laparoscopic UUT reconstructions performed between May 2012 and May 2021. Anomalies included: malrotated kidney (MRK), horseshoe kidney (HSK), duplex kidney (DK), pure intrarenal pelvis (IRP) and mid-ureteric stenosis (MUS). Success was defined by postoperative resolution of symptoms, improvement of anterior-posterior renal pelvic diameter (APD) on US and drainage on Mag3. Complications were categorised by Clavien-Dindo grading. Outcomes compared using the student's t-test with P<0.05 considered statistically significant. Of the 214 laparoscopic primary UUT reconstructions, 37 (17.2%) were: 13-MRK, 12-HSK, 4-DK, 4-IRP and 4-MUS. Median age at surgery was 5-years (range 0.3-15). Dismembered pyeloplasty: 8; pyeloplasty with renal sinus dissection: 8; neo-PUJ anastomosis: 8; primary ureterocalycostomy: 7; pyeloureterostomy: 2; and uretero-ureterostomy: 4. Median follow-up was 43-months (range 8-108) with a success rate of 94.5% (35/37). Complete resolution of symptoms in 20/21 patients; improvement of hydronephrosis on US in 35/37 patients (median pre-operative APD 27mm vs. median postoperative APD 8mm) [P<0.001]; improvement of drainage on diuretic renogram in 32/34 kidneys and stable/improved DRF in 34/35 kidneys (median preoperative DRF - 45% vs. median postoperative DRF - 47%) [P>0.05]. Postoperative complications managed medically (II Clavien) included urinary tract infections - 2 patients (5%), stent-related symptoms in 2 (5%) and umbilical port site collection in 1 patient (3%). Recurrent pelvi-ureteric junction obstruction PUJO occurred in one patient (3%) requiring redo surgery (IIIb Clavien), renal stones in 1 (3%) which resolved with ESWL (IIIb Clavien); in 1 (3%) patient with a HSK there was complete loss of ipsilateral kidney function but this was managed conservatively up to date (I Clavien). Laparoscopic transperitoneal approach allows the prompt recognition of in-situ anatomical variants. UUT obstruction in such settings calls for a variety of strategies with excellent outcomes.

Vascular and Urinary Tract Anatomic Variants Relevant to Para-Aortic Lymphadenectomy in Women with Gynecological Cancers.

Para-aortic lymphadenectomy is an essential part of gynecologic oncologic surgical treatment. The surgeon should be aware of the complex usual anatomy and its common variants. Between January 2021 and May 2023, 58 women underwent para-aortic lymphadenectomy for gynecologic malignancies. Vascular and urinary tract anatomic variants were retrospectively reviewed from the prospective institutional database and results were compared with preoperative contrast-enhanced abdominal CT. Of these 58 women, 47 women had no vascular or urinary tract variants. One woman had a double inferior vena cava, two patients were found to have a retro-aortic left renal vein, four had accessory renal arteries, two had a double left ureter, one had a ptotic kidney in the iliac fossa, and one patient had bilateral kidney malrotation. Anatomic variants in the preoperative CT were described by a radiologist in only two patients, and additional vascular and urinary tract variants were found incidentally at the time of surgery. Acknowledgment of vascular and urinary tract variants is helpful for the surgeon to establish an appropriate surgical plan and to avoid iatrogenic surgical trauma.

PD45-10 A MULTICENTER PROPENSITY SCORE MATCHED PAIR STUDY IN 313 PATIENTS COMPARING PERCUTANEOUS NEPHROLITHOTOMY VERSUS RETROGRADE INTRA RENAL SURGERY FOR MANAGEMENT OF UROLITHIASIS IN CALYCEAL DIVERTICULUM

PD45-10 A MULTICENTER PROPENSITY SCORE MATCHED PAIR STUDY IN 313 PATIENTS COMPARING PERCUTANEOUS NEPHROLITHOTOMY VERSUS RETROGRADE INTRA RENAL SURGERY FOR MANAGEMENT OF UROLITHIASIS IN CALYCEAL DIVERTICULUM

Ectopic and Mal-rotated kidney with bilateral hydronephrosis – Case report

INTRODUCTION: The term ectopic kidney is used to describe a kidney that is found in a place that is not its normal anatomic position while malrotation refers to the abnormal orientation of the kidney. These two are some of the congenital malformations that the kidney is predisposed to in its embryogenesis.CASE: The current findings were discovered during routine dissections in the Gross lab of the Human Anatomy Department of the University of RwandaA left ectopic kidney with a relatively larger than normal size (10.5cm × 5.2cm) was found with the main blood supply arising from the median sacral artery and two other accessory arterial supplies arising from the abdominal aorta. The kidney was mal-rotated, facing laterally, with the ureter on both sides dilated. CONCLUSION: Knowing kidney variations is ever more important with the rate of increase in renal transplantations and vascular surgeries

Triplicate Ureter with Complicated Ureteral Cyst in an Ectopic Malrotated Kidney: A Rare Association

One of the rarest anomalies of the renal collecting system is ureteral triplication along with the presence of a complex ureteral cyst. We describe an unusual case of a 37-year-old man who presented with fever and abdominal pain. Computed tomography urography (CTU) revealed triplication of the ureter in association with renal ectopia and a ureteral cyst which was complicated by calculi formation. Following treatment with antibiotics, the patient was managed by open ureterolithotomy with resection of the ureteral cyst and tailoring of the ureter.

Ultrasound-guided percutaneous nephrolithotomy in patients with retrorenal colon: a single-center experience.

Retrorenal colon is a risk factor for colonic injury during percutaneous nephrolithotomy (PCNL). Our aim in this study is to report the feasibility and outcomes of ultrasound-guided percutaneous nephrolithotomy in patients with preoperatively known retrorenal colon by cross-sectional imaging. In this prospective study, all patients with large renal stones and retrorenal colon in preoperative cross-sectional imaging from September 2020 to January 2022 who were candidates for PCNL were enrolled. Percutaneous access was established by ultrasonography guidance by the freehand method with dilation of the tract by a combination of fluoroscopy and ultrasonography. Of the 1123 patients (Male = 760 and Female = 363) who underwent PCNL, 13 patients (Male = 6 and Female = 7) had retrorenal colon in the preoperative computed tomography. The series included two patients with malrotated kidneys. Complete stone clearance was achieved in 11 patients. Patients were followed up for at least 3months. No serious postoperative complications were observed during follow-up. In selected patients and experienced hands, ultrasound-guided PCNL can be an alternative option for the treatment of patients with large renal stones who have retrorenal colon in cross-sectional imaging.

MP14-11 PROPENSITY SCORE-MATCHED ANALYSIS COMPARING RETROGRADE INTRARENAL SURGERY WITH PERCUTANEOUS NEPHROLITHOTOMY IN ANOMALOUS KIDNEYS

MP14-11 PROPENSITY SCORE-MATCHED ANALYSIS COMPARING RETROGRADE INTRARENAL SURGERY WITH PERCUTANEOUS NEPHROLITHOTOMY IN ANOMALOUS KIDNEYS

Propensity score-matched analysis comparing retrograde intrarenal surgery with percutaneous nephrolithotomy in anomalous kidneys.

Endourologic interventions for urolithiasis in patients with anomalous kidneys can be challenging, and comparisons between these interventions are not well studied. We aim to compare the safety, outcomes and complications of retrograde intrarenal surgery (RIRS) versus percutaneous nephrolithotomy (PCNL) in patients with urolithiasis in anomalous kidneys. A propensity score-matched pair analysis (PSM) was performed on pooled patient data from 20 centers. 569 patients with anomalous kidneys (horseshoe kidney [HSK], ectopic kidney, malrotated kidney) and urolithiasis who received either PCNL or RIRS as the primary modality of intervention from 2010 to 2020 were analyzed. Patients were matched based on calculated propensity scores by a regression model using age, sex, comorbidities, stone size, and renal anomaly type as co-variates. Multivariate logistic regression of factors (mode of treatment [PCNL or RIRS], comorbidities, stone size) and their effects on outcomes of stone-free rate (SFR), need to abandon surgery due to intraoperative difficulty, postoperative hematuria and sepsis and were analyzed when applicable. After PSM, there were a total of 127 pairs in each group. Overall, PCNL conferred a higher SFR compared to RIRS (OR=3.69, 95% CI 1.91-7.46, P<0.001), particularly in HSK (OR=3.33, 95% CI 1.22-9.99, P=0.023), and ectopic kidneys (OR=18.10, 95% CI 3.62-147.63, P=0.002), with no significant difference in malrotated kidneys. There was no significant difference in postoperative sepsis observed. Surgery was abandoned more often in RIRS than PCNL (6.3% vs. 0%, P=0.014). Although PSM provides a robust analysis due to baseline differences in the unmatched cohorts, this study was limited by an inevitable degree of selection bias. While both modalities are safe and efficacious, PCNL yields better SFR than RIRS in patients with anomalous kidneys, with no difference in postoperative sepsis rates. Patients may benefit from personalized management best carried out in high volume endourology centers.

Partial Mullerian Agenesis with Renal and Skeletal Anomalies: An Observational Study of MURCS Association

Background: Müllerian agenesis is a disorder of genital development characterized by absence of the vagina, an absent or hypoplastic uterus, and normal or hypoplastic fallopian tubes. Typically, the ovaries are entirely normal, although one or both also may be undescended, hypoplastic, or associated with an inguinal hernia. Affected patients often also have urologic anomalies (15-40) % (unilateral renal agenesis, ectopic or horseshoe kidney, and duplication of the collecting systems) and skeletal malformations (5-10) %, (e.g., hemiverterbrae and scoliosis, or the Klippel-Feil syndrome). The cause is unknown, although some cases are associated with chromosomal translocations or occur in familial aggregates, suggesting a genetic basis. Logically, müllerian agenesis might be attributed to an activating mutation in the gene encoding AMH or its receptor, causing excess AMH activity, but none have been identified. Aim: The aim of this study was to analyze and present rare cases of partial mullerian agenesis combined with renal and/or skeletal malformations, their causes, clinical features, diagnosis and treatment along with review of literatures. Methods: A retrospective observational study was conducted in the department of Bangabandhu Sheikh Mujib Medical University. All four cases presented with similar type of presentation and were diagnosed as partial Mullerian aplasia (cervico-vaginal agenesis) with other associated anomalies (renal, skeletal or cardiac anomalies) ie: MURCS association. Results: We analysed four cases of mullerian agenesis with renal and/or skeletal abnormalities presented with primary amenorrhoea with cyclical lower abdominal pain. Subsequently these patients were ascertained to have cervicovaginal agenesis with renal and skeletal abnormalities by physical examination and relevant investigations. Two (50%) patients had renal anomalies in the form of renal agenesis and one small malrotated kidney while 100% patients had skeletal abnormalities. One (25%) patient had congenital cardiac anomaly, one (25%) patient had history of cleft lip and cleft palate and one (25%) patient had history of imperforated anus at birth. Evaluation included clinical examination, whole abdominal ultrasound, skeletal survey and karyotyping along with some supportive investigations. Conclusion: The management is varied but multidisciplinary approach, psychological and social supports are the key points of managing such cases.

Real-world Global Outcomes of Retrograde Intrarenal Surgery in Anomalous Kidneys: A High Volume International Multicenter Study

ObjectiveTo analyze the trends and outcomes of retrograde intrarenal surgery for treatment of urolithiasis in anomalous kidneys in a large international multicenter series. Materials and MethodsWe designed a multicentric retrospective study. Nineteen high-volume centers worldwide were included. Pre-, peri- and postoperative data were collected, and a subgroup analysis was performed according to renal anomaly. ResultsWe analyzed 414 procedures: 119 (28.7%) were horseshoe kidneys, 102 (24.6%) pelvic ectopic kidneys, 69 (16.7%) malrotated kidneys and 50 (12.1%) diverticular calculus. The average size (SD) of the stone was 13.9 (±6) millimeters and 193 (46.6%) patients had a pre-operative stent. In 249 cases (60.1%) a disposable scope was used. A UAS (ureteral access sheath) was used in 373 (90%) patients. A Holmium laser was used in 391 (94.4%) patients. The average (SD) operating time was 65.3 (±24.2) minutes. Hematuria, caliceal perforation and difficulty in stone localisation were mostly seen in diverticular stones and difficulty in UAS placement and lithotripsy in the cases of renal malrotation. The overall complication rate was 12%. Global stone-free rate was 79.2%. Residual fragments (RF) were significantly lesser in the pre-stented group (P <.05). Diverticular calculi was the group with more RF and needed ancillary procedures (P <.05). ConclusionRetrograde intrarenal surgery in patients with anomalous kidneys is safe and effective with a high single-stage stone-free rate and low complication rate. There is a trend toward using smaller and disposable scopes and smaller UAS. Diverticular stones can still be challenging with higher rates of intraoperative hematuria, caliceal perforation and RF.

Effectiveness and Safety of Percutaneous Nephrolithotomy (PCNL) in Malrotated Kidneys

Background and Aim: The renal stones of any size could be effectively managed through an essential surgical technique known as Percutaneous Nephrolithotomy (PCNL). The large size renal stones with abnormal kidneys imposed additional challenges for PNCL in anomalous kidneys. The present study aimed to evaluate the effectiveness and safety of Percutaneous Nephrolithotomy in malrotated kidneys. Place and Duration: Conducted at Urology department of Mian Gul Abdulhaq Jehanzeb Kidney Hospital Manglawar, Swat for duration of two years (from May 2019 to April 2021). Materials and Methods. This single-centered retrospective study was conducted on 80 patients who underwent percutaneous nephrolithotomy with malrotation kidneys. The individuals with anomalous kidneys and complex calculi were enrolled in this study. These patients had kidneys anomalies such as horseshoe kidneys, crossed fused ectopia, malrotation kidneys, pelvic and complete stone clearance. Posterior or anterior approaches were followed for the procedure after preoperative evaluation in kidney anomalies. Retrograde catheterization was carried out under spinal and general anesthesia with the patients. For all the patients, stone size and clearance were measured. Results: Of the total 80 kidneys anomalies patients, 55 (68.7%) were male and 25 (31.3%) were females. Overall mean age was 35.26 ± 13.51. The stone size varied from 1.3cm to 7 cm. Patients were categorized into two groups based on stone sizes such as group I (1.3-2.5 cm) had 42 (52.5%) and group II (25-7cm) 38 (47.5%) patients. The patients included renal pelvis 19 (23.6%), the pelvic ureteric junction (PUJ) 8 (10%), horseshoe kidneys 2 (2.5%), crossed fused ectopia 9 (11.3%), and malrotation kidneys 3 (3.8%).The stone clearance was completed in 77 (96.3%) patients. The statistically significant factor for complete clearance was the staghorn stone calculus. Conclusion: Percutaneous nephrolithotomy is a safe and effective procedure for large renal stones management in patients of anomalous kidneys. Higher renal stones clearance can be achieved with minimum morbidity by suitable preoperative evaluation and technical experts. Keywords: Malrotated kidney; Nephrostomy, Percutaneous; Nephrolithiasis; Abnormality

Laparoscopic Resection of Renal Capsular Endometriosis in a Woman with Menstrual-Related Flank Pain: Case Report

BackgroundAlthough involvement of the urinary system is not uncommon, endometriosis in the kidneys is rare. To date, laparoscopic partial nephrectomy has been the preferred approach for managing renal endometriosis. Here, we report for the first time the results of laparoscopic removal of a renal capsular endometriosis in a malrotated kidney in an attempt to save the whole kidney parenchyma, in terms of feasibility and safety.Case presentationA 37-year-old female presented with periodic right flank pain associated with her menstrual cycle. On imaging, a malrotated right kidney and a hypodense irregular-shaped lesion measuring 30 * 20 * 15 mm were seen in the superior portion of the right perinephric space. Histologic evaluation of the ultrasound-guided biopsy was consistent with renal capsular endometriosis. The patient underwent laparoscopic surgery to remove the capsular mass while preserving the normal renal parenchyma. Pathological examination of the biopsy obtained during surgery was in favor of renal endometriosis. At 6-month follow-up, the patient’s pain had completely disappeared and no complications had occurred. In addition, imaging did not show any remarkable recurrence.ConclusionRenal endometriosis should be strongly considered as a differential diagnosis in female patients with a renal capsular mass and exacerbation of flank pain during menstruation. Based on our experience, with preoperative needle biopsy and clearing the pathology, laparoscopic removal of the mass in spite of renal anatomic abnormality is feasible and safe and thus could be considered as a possible treatment option.

Bilateral pelvic kidneys with upper pole fusion and malrotation: a\xa0 case report and \xa0review of the\xa0literature

BackgroundThe incidence of ectopic kidneys is 1:12,000 clinically and 1:900 postmortem. Patients with pelvic mal-rotated kidneys are more susceptible to recurrent urinary tract infections, recurrent renal stones, and renal injury. Fusion of the kidney lower poles is relatively common compared to other types of renal anomalies.Case presentationWe present the case of a 36-year-old Sudanese female patient who presented with a long history of recurrent urinary tract infections unresponsive to antibiotics. Ultrasound scan revealed bilateral pelvic kidneys. Computed tomography (CT) urography confirmed bilateral ectopic fused kidneys, with the left kidney mal-rotated (renal pelvis facing upwards and laterally). Kidney infection secondary to vesicoureteral reflux was diagnosed. Antibiotics were prescribed according to culture and sensitivity. The patient responded well to ciprofloxacin.ConclusionA history of recurrent urinary tract infections without an apparent cause is highly suggestive of renal anomaly and should be investigated expediently. Ultrasonography or CT imaging may be utilized to aid in diagnosis. Early recognition may help prevent the high risk of end-stage renal failure associated with anomalies.

Percutaneous nephrolithotomy for large renal stones in anomalous kidneys

Background: Percutaneous nephrolithotomy (PCNL) is an important surgical method for managing renal stones of any size. Anomalous kidneys pose additional technical challenge to the operating surgeon to perform PCNL in these anatomically abnormal kidneys especially if the stone load is large. The aim of this study is to present the efficacy and limitations of PCNL in managing stones &gt;2 cm in size in anomalous kidneys.Methods: This was a retrospective single centre study of PCNL in anomalous kidneys with stones &gt;2 cm in size.Results: 30 patients of kidney stones &gt;2 cm underwent PCNL. Our series of patients included 19 (63.32%) cases of horseshoe kidneys, 9 (30%) malrotated kidneys, 1 (3.34%) pelvic and 1 (3.34%) crossed fused ectopia. We achieved complete stone clearance in 26 (86.67%) patients. Presence of staghorn calculus was the most important statistically significant factor limiting complete clearance.Conclusion: PCNL is an effective procedure for management of patients with large stones in anomalous kidneys. Appropriate preoperative evaluation especially imaging, appropriate selection of cases and most importantly excellent technical expertise is needed to achieve high stone clearance rates with minimal morbidity.

Ultrasound-Guided Access in a Malrotated Kidney: Optimally Safe and Effective.

Background: Management of renal calculi in a patient with kidney malrotation can be difficult because of complexity and alteration of collecting system anatomy. Pyelolithotomy, whether open, laparoscopic, or robotic, has been shown to be an effective method of stone removal in this patient population; however, it is not always ideal because of its invasiveness and increased morbidity. Ideally, a percutaneous approach may be less invasive, and if feasible, it can optimize patient safety and stone-free status. Case Presentation: Here we present a case of a 68-year-old Caucasian female who presented with 2.7 cm stone in the renal pelvis of a severely malrotated left kidney, which was managed using a combination of fluoroscopy and ultrasound (US)-guided percutaneous nephrolithotomy. Conclusion: US-guided access properly delineates the anatomic complexities of a severely malrotated kidney and permits safe percutaneous management of large stones. This is because fluoroscopic guidance alone may lead to inadvertent adjacent visceral organ trauma and increased risk of parenchymal and intrarenal vascular injury.

An exceptionally rare cause of fetal megacystis in a male fetus

Megacystis in a male fetus is most commonly due to posterior urethral valves (PUV). Reported incidence ranges from 1:5000–1:8000 births. Other causes of megacystis in a male fetus include prune belly syndrome, neurogenic bladder, bilateral high grade V-U reflux etc. We are presenting a case of megacystis diagnosed at 27 weeks gestation, due to large tortuous ectopic ureter from a single system inserting into the prostatic urethra. This case highlights the interesting diagnostic and management challenges encountered with an exceptionally rare malformation causing bladder outlet obstruction. The antenatal ultrasound at 20 week gestation was normal. By 33 weeks, bilateral pelvicalyceal dilatation and bilateral hydroureter was seen; additionally, bladder appear enlarged. Ultrasound at 39 week gestation suspected the right ureteric insertion to be ectopic into the bladder neck. Follow up scans demonstrated worsening hydroureteronephrosis and megacystis. The amniotic fluid volume remained within normal limits. Working diagnosis was bladder outlet obstruction due to PUV. His post-natal ultrasounds, MCUG and MRU confirmed a single system on the right side with ectopic insertion into the prostatic urethra causing bladder outlet obstruction. On the left a low lying malrotated kidney & grade 4-5 vesicoureteric reflux was noted. Serum creatinine was high in the neonatal period. He underwent cystoscopy to confirm the ectopic right ureteric insertion. The right ureter was disconnected from prostatic urethra and an end cutaneous ureterostomy was performed to relieving bladder outlet obstruction and allowing better decompression of right ureter. At 9 months follow-up his renal function had normalized and he had a good urinary stream. The right ureter will be re-implanted to the bladder at 2 years of age. There are few similar cases of similar cases of megacystis in the literature. Ectopic ureters inserting into posterior urethra causing bladder outlet obstruction in all case reports are diagnostic conundrum and must be considered as rarer differential diagnoses to PUV.

Is Laparoscopic Pyeloplasty for Ureteropelvic Junction Obstruction in Infants Under 1 Year of Age a Good Option?

Purpose: Laparoscopic pyeloplasty in children younger than 1 year of age is still debatable due to its supposed technical difficulties and failure rate. We present our experience and outcome in infants.Materials and Methods: A retrospective study was conducted in 3 Departments of Pediatric Surgery. We reviewed the records of the children under 1 year of age operated on for ureteropelvic junction obstruction (UPJO), between 2007 and 2017. Anderson-Hynes laparoscopic transabdominal dismembered pyeloplasty was performed. Patients' demographics, results of preoperative and postoperative exams, perioperative details, complications, hospital stay, and long-term follow-up results were analyzed.Results: Sixty cases were operated on during this period (49 boys, 11 girls). Mean age at operation was 4.5 months (1–12 months). Mean operating time was 140 min (80–240 min). There was no conversion in this group. There were four early complications: 1 ileus, 1 hypertension immediately post-operatively requiring medical treatment, 1 omental herniation through a drain orifice, and 1 percutaneous transanastomotic stent migrated intra-abdominally. The two last children had to be reoperated. Mean hospital stay was of 2 days (1–10 days). Late complications: two patients (3.4%) presented a recurrence of UPJO, one had been re-operated 15 months later and for the patient with persistent hypertension, nephropexy was performed for malrotated kidney, 1 year after pyeloplasty. Long term follow-up with a mean of 2.8 years (1–10 years) showed that surgery improved mean pelvic dilatation from 31.8 mm (13–63 mm) preoperatively to 15.3 mm (4–40 mm) postoperatively (P < 0.0001). The renal function slightly improved, from a mean of 35.7% (5–55%) it passed to 40.5% (0–54%), p = 0.137. In three cases the operated kidney became finally non-functional and atrophic.Conclusions: Laparoscopic transperitoneal pyeloplasty is feasible and safe in children younger than 1 year of age. Nevertheless, it requires experience and good intra-abdominal suturing skills. Laparoscopic pyeloplasty has a success rate comparable with open treatment but with less morbidity and better cosmetic results.