Revised guidelines on management of antenatal hydronephrosis

Area of Science:

• Pediatric Nephrology
• Fetal Urology
• Diagnostic Imaging

Background:

• Antenatal screening detects more kidney and urinary tract anomalies.
• Antenatal hydronephrosis (ANH) often resolves spontaneously.
• Oligohydramnios and other anomalies indicate severe pathology.

Purpose of the Study:

• To update guidelines for managing antenatal hydronephrosis (ANH).
• To define criteria for postnatal evaluation and intervention.
• To clarify management strategies for urinary tract obstructions.

Main Methods:

• Postnatal ultrasonography for all ANH cases.
• Evaluation based on renal pelvis anteroposterior diameter (APD) and Society for Fetal Urology (SFU) grading.
• Screening for obstruction and reflux in high-risk infants.

Main Results:

• Most ANH cases resolve by the third trimester.
• APD >10 mm or SFU grade 3-4 warrants further investigation.
• Antibiotic prophylaxis recommended for infants with vesicoureteric reflux.

Conclusions:

• Management depends on postnatal findings and specific diagnoses.
• Surgery considered for progressive hydronephrosis or impaired renal function.
• Further research needed on prenatal interventions and surgical indications.