Primary obstructive megaureter: initial experience with endoscopic dilatation.
OBJECTIVE
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.


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 A Double-J catheter was positioned and withdrawn 2 months after the procedure.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.
Angerri
Oriol
O
Pediatric Urology Unit, Urology Department, Fundació Puigvert, Barcelona, Spain. 33802oaf@comb.es
Caffaratti
Jorge
J
Garat
José María
JM
Villavicencio
Humberto
H
D002404:Catheterization / Q000295:instrumentation / Q000379:methods*; D020684:Cystoscopes; D004724:Endoscopy / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007668:Kidney / Q000473:pathology; D008297:Male; D013997:Time Factors; D016896:Treatment Outcome; D014463:Ultrasonography / Q000379:methods; D014513:Ureter / Q000601:surgery; D014517:Ureteral Obstruction / Q000150:complications / Q000175:diagnosis* / Q000601:surgery*; D014546:Urinary Catheterization / Q000379:methods*; D014551:Urinary Tract / Q000002:abnormalities; D014718:Vesico-Ureteral Reflux