Abstract
Seventeen children with unilateral mild hydronephrosis (ureteropelivic junction obstruction) were followed nonoperatively for a long period. Patients age at diagnosis ranged from 3 months to 4 years, and a follow-up period from 10 to 21 years. The grade of hydronephrosis was low (grade I and II) in 14 kidneys and medium (grade III) in 3 kidneys. No children demonstrated alteration of hydronephrosis grade or thinning of renal parenchyma during the follow-up period. We conclude that surgical intervention is not indicated in most of low grade and some of medium grade hydronephrosis. However, a close follow-up of these patients is mandatory because of potential worsening of hydronephrosis.
