" congenital narrowing at PUJ due to :
-abnormal muscle arrangement
-anomalous collagen collar
-abnormal lower polar vessel crossing
1 per 1000 newborns
Diagnostic:
Intermittent pain after drinking large volumes of fluid
Diagnosed on prenatal ultrasound
Confirmed by Diuretic isotope renogram
TREATMENT:
Pyeloplasty
Balloon dilataion and stenting"