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Primary obstructive megaureter: initial experience with endoscopic dilatation
Oriol Angerri1, Jorge Caffaratti, José María Garat
1Pediatric Urology Unit, Urology Department, Fundació Puigvert, Barcelona, Spain. 33802oaf@comb.es
Insights
Endoscopic balloon dilatation offers a minimally invasive option for primary obstructive megaureter (POM) in children. This technique shows promising short-term success, potentially avoiding open surgery.
Area of Science:
- Pediatric Urology
- Minimally Invasive Surgery
Background:
- Primary obstructive megaureter (POM) is a congenital condition.
- Traditionally managed with open ureteral reimplantation surgery.
- Endoscopic balloon dilatation presents an alternative approach.
Purpose of the Study:
- To evaluate the efficacy of endoscopic balloon dilatation for POM.
- To assess outcomes in pediatric patients treated with this technique.
Main Methods:
- Seven pediatric patients with POM underwent balloon dilatation.
- Procedures performed using infant cystoscope and dilating balloon under fluoroscopy.
- Follow-up included ultrasonography and MAG-3 renography.
Main Results:
- High clinical satisfaction reported.
- Reduced obstruction observed in five patients post-procedure.
- One patient required repeat dilatation; another experienced a urinary infection.
Conclusions:
- Endoscopic balloon dilatation demonstrates good short-term results for POM.
- Further long-term follow-up is needed to establish definitive indications.
Background And Purpose:
Primary obstructive megaureter (POM) without vesicoureteral reflux has classically been managed by open surgery with ureteral reimplantation. We present seven patients with POM who were treated endoscopically with balloon dilatation of the distal ureter.
Patients And Methods:
Six boys and one girl with POM were treated from June 2000 through July 2004. Six of the cases were diagnosed prenatally when ectasia of the urinary tract was seen on ultrasound scans. The postnatal diagnosis was also achieved by ultrasonography, along with a diuretic isotopic renogram with MAG-3, intravenous urography, and filling cystography. The age at surgery was 1 to 3 years. In all cases, a compact 10F infant cystoscope with a 5F working channel was used. Dilatation of the stenotic area was performed under fluoroscopic monitoring. A 4F dilating balloon was used, which was insufflated to between 12 and 14 atm for 3 to 5 minutes, and disappearance of the narrowed ring was verified. A Double-J catheter was positioned and withdrawn 2 months after the procedure. Clinical, analytical, and imaging follow-up was carried out with ultrasonography and MAG-3 renography.
Results:
The mean follow-up of the patients is 31 months (range 12-56 months). Their clinical progress was highly satisfactory. Five patients exhibited reduced obstruction at MAG-3. One patient needed a second dilatation, and the obstructive curve improved after this additional procedure. One of the patients presented with a febrile urinary infection after the dilatation, but there were no other complications.
Conclusions:
Endoscopic management of POM by balloon dilatation has yielded very good results in the short term. Longer follow-up will enable us to determine the final indications for this treatment.
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