Which are the symptoms?
This isolated foetal pathological condition is not associated with maternal morbid conditions.
How is it diagnosed?
Detailed ultrasound examination (especially of the contralateral kidney).
Karyotyping should be offered only if other markers are present.
How is it treated?
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 reflux that requires postnatal follow-up and possible surgery. Moderate hydronephrosis is usually progressive and in more than 50% of cases surgery is necessary during the first 2 years of life.