Figure 3.

Prenatal monitoring in patients with antenatally detected hydronephrosis. All fetuses with ANH should undergo at least one ultrasound in third trimester, and its severity is graded according to renal pelvic anteroposterior diameter [Table 3]. Fetuses with bilateral hydronephrosis need monitoring through pregnancy, the frequency of which depends on severity of findings and presence of oligohydramnios. Those with oligohydramnios or other systemic abnormalities should be referred to specialized centers. While all newborns with antenatally detected hydronephrosis should undergo ultrasonography in the first week of life, those with suspected bladder obstruction should undergo postnatal ultrasonography within 48 hr of birth