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from Section 8 - Fetal Complications
Published online by Cambridge University Press: 08 April 2025
Mild urinary tract dilation (formerly termed fetal pyelectasis or hydronephrosis) of the fetus is the most common variant identified on the fetal anatomic survey ultrasound. This finding can indicate an increased risk of aneuploidy, specifically Trisomy 21, however, it is also common in genetically normal pregnancies. New noninvasive prenatal testing options have reduced the need for invasive fetal genetic testing previously required for antenatal diagnosis. Surveillance during the pregnancy and neonatal period should be performed as urinary tract malformation can also result in renal pelvis dilation. Severe dilation should prompt the involvement of pediatric urology prior to birth for neonatal planning.
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