Postnatal management of antenatally detected hydronephrosis

Table 1 Differential diagnosis of prenatal hydronephrosis

Etiology	Incidence
Transient/physiologic	50%-70%
PUJ obstruction	10%-30%
Vesicoureteral reflux	10%-40%
Ureterovesical junction obstruction	5%-15%
Multicystic dysplastic kidney	2%-5%
Posterior urethral valves	1%-5%
Ureterocele	1%-5%
Others like ectopic ureter, etc.	< 1%

PUJ: Pelviureteric junction.