antenatal hydronephrosis
Fetal kidney swelling detected on prenatal ultrasound, requiring postnatal urological evaluation.
Full Definition
Antenatal hydronephrosis refers to dilatation of the fetal renal collecting system identified on prenatal ultrasound imaging. This finding may represent various conditions ranging from transient physiological dilatation to significant obstructive uropathy requiring intervention. The Society for Fetal Urology grading system helps standardize severity assessment. Postnatal evaluation typically includes repeat ultrasound after 48 hours of life and often requires additional imaging such as VCUG or nuclear medicine studies. Management depends on the underlying cause and degree of renal function impairment.
Usage
Usage note: Specify SFU grade when available; distinguish from postnatal onset hydronephrosis.
In Context
- "Severe antenatal hydronephrosis was noted at 20 weeks with oligohydramnios." — Prenatal consultation report
- "Postnatal ultrasound confirmed resolution of mild antenatal hydronephrosis." — Newborn follow-up note