Why is the diameter of the fetal lateral ventricle measured during routine second trimester Ultrasound

Why is the diameter of the fetal lateral ventricle measured during routine second trimester Ultrasound?

Measurement of the width of the lateral ventricle at the atrium is a standard second trimester fetal measurement used to detect hydrocephalus. Normally, the lateral ventricle diameter is <10 mm (usually 4 to 8 mm). A lateral ventricle measurement >10 mm is indicative of hydrocephalus.

A dangling choroid plexus surrounded by fluid in the lateral ventricle is a secondary sign of hydrocephalus. Possible etiologies for fetal hydrocephalus include cerebral acqueductal stenosis, neural tube defect with Chiari malformation, Dandy Walker malformation, hemorrhage, and infection.

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