Fetal hydronephrosis is the swelling of the kidney when too much urine collects in the pelvis (or basin) of the kidney. Learn more about causes and symptoms.

This leaflet is to help you understand what Fetal Hydronephrosis is, what tests you need and the implication of being diagnosed with Hydronephrosis for your baby and your family.

Sep 29, 2025 · The definition, etiology, and management of fetal hydronephrosis are reviewed here. Postnatal evaluation of fetal hydronephrosis and specific urologic conditions that may …

Nov 1, 2024 · Fetal hydronephrosis represents the abnormal dilatation of the fetal renal collecting system, with pelviureteric junction obstruction the most commonly encountered cause.

Overview of hydronephrosis—enlargement of the renal pelvis in the kidney—in newborns, which is often diagnosed before birth during a prenatal ultrasound.

When should these tests be performed if a prenatal ultrasound showed hydronephrosis? The decision to perform these tests depends on several factors including the severity of the …

Prenatal hydronephrosis causes kidney swelling in unborn babies. Most cases resolve without treatment; some may need monitoring or surgery.

In the majority of cases, the condition remains stable or resolves in the neonatal period. In about 20% of cases, there may be an underlying ureteropelvic junction obstruction or vesicoureteric …

Learning About Fetal Hydronephrosis What is hydronephrosis? Fetal hydronephrosis is swelling of a baby's kidney caused by a buildup of urine. This can happen while the baby is still in the …

Fetal hydronephrosis, or kidney swelling, occurs when too much urine backs up into an unborn baby’s kidneys.