Antenatal Hydronephrosis. Antenatal Hydronephrosis. Definition: AP diameter renal pelvis > 4mm @ 20 wk EGA AP diameter renal pelvis > 7mm @ 30 wk EGA Incidence: 5% of pregnancies. Antenatal Hydronephrosis. Standard work-up: Postnatal ultrasound Look for AP diameter
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AP diameter renal pelvis > 4mm @ 20 wk EGA
AP diameter renal pelvis > 7mm @ 30 wk EGA
Most diagnoses made based on a finding of prenatal hydronephrosis can be handled conservatively.
However, until we have better ways to predict who will require intervention, a complete work-up, including RBUS and VCUG is warranted in all pts with an AP renal diameter >4mm prenatally.