Antenatal Hydronephrosis
Ashish Jain, Madhavi Bharadwaj
Abstract
A 26-year-old primigravida underwent a level-2 antenatal ultrasonography (USG) at 20 weeks of gestation. The USG revealed bilateral hydronephrosis with anteroposterior pelvic diameters (APPDs) of the swelling being 7 mm on the right kidney and 12 mm on the left kidney. No other anomaly was detected on detailed fetal evaluation.
Conclusions
Antenatal hydronephrosis (ANH) is one of the most common findings on antenatal USG. Most of the cases resolve spontaneously on follow-up. Isolated ANH is not an indicator of invasive prenatal workup, diagnostic or therapeutic interventions, or termination of pregnancy. Those cases complicated with lower urinary tract anomalies or renal malformations may require diagnostic or therapeutic interventions, genetic workup, and frequent follow-up USG examinations. All cases of ANH diagnosed in the second trimester should be followed up in the third trimester and postnatally, within the first week of birth.
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