Treatment of the primary functional obstructive megaureter in childhood.

The results of management of primary functional obstructive megaureter are reported in 29 children with 35 obstructed renal units. Grade 1 dilatation was found in 5 renal units, grade 2 in 14 and grade 3 in 16. Grade 1 and uncomplicated grade 2 obstructions were treated expectantly. Surgery was necessary in one grade 1 obstruction deteriorating to grade 2 and in two cases grade 2 with persistent urinary tract infections and deteriorating renal scans. All grade 3 ureters were treated by surgery: in 14 cases reimplantation was combined with calibre reduction of the ureter. In a majority of the patients the results were good in all grades of obstruction and no failures were seen.