[Primary obstructive megaureters: long-term follow-up].

Introduction: The objective of this study was to evaluate the clinical outcome of primary megaureters and to evaluate predictive factor for surgery need based on ultrasound values.

Methods: A total of 43 primary obstructive megaureters detected in 41 patients have been evaluated between January 2000 and may 2010.

Results: Mostly boys (73%) were concerned by megaureters, mainly on the left side (66%). Twenty patients were prenatally diagnosed. Surgical indications were: pyonephrosis (3), recurrent pyelonephritis (14), scintigraphic damage (3), ureteric diameter aggravation (7), disease occurring on unique kidney (2). Regarding the 30 patients who benefit surgery, the retrovesical ureter measured, before surgery 19.15 mm (± 7.17) on average and 3.18 mm, 44 months later. Over the 10 patients treated medically, the initial diameter was 9.91 mm and at the end of the study, five patients had megaureter completely regressed, three patients had a diameter greater than 10mm at the end of the study and two faced a worsening evolution with sudden and complete renal damage on scintigraphic nephrogram, after recurrent pyelonephritis despite antibioprophylaxis.

Conclusion: We recommend a careful watch-fulling of primary megaureters; mainly for those with recurrent infections and whenever the retrovesical ureter diameter exceeds 14 mm at first ultrasound.