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) is a common finding, frequently transient.
• Updated guidelines are needed for managing ANH detected during pregnancy.

Purpose of the Study:

• To provide updated recommendations for the evaluation and management of antenatal hydronephrosis.
• To guide postnatal follow-up based on specific ultrasonographic parameters.
• To clarify indications for intervention in cases of significant urinary tract obstruction.

Main Methods:

• Review and update of existing guidelines for ANH management.
• Postnatal ultrasonography for all ANH cases.
• Further evaluation based on renal pelvis anteroposterior diameter (APD) and Society for Fetal Urology (SFU) grading.
• Screening for obstruction and vesicoureteric reflux (VUR) in high-risk infants.

Main Results:

• ANH resolves by the third trimester in nearly half of cases.
• Oligohydramnios and additional anomalies indicate significant pathology.
• Postnatal APD >10 mm or SFU grade 3-4 warrants screening for obstruction and VUR.
• Antibiotic prophylaxis recommended for infants with VUR in the first year.

Conclusions:

• Management strategies for ANH are guided by postnatal ultrasound findings.
• Surgery for pelviureteric or vesicoureteric junction obstruction is considered with worsening parameters or impaired renal function.
• Further research is needed on prenatal interventions and surgical indications.