Overview
- Cerebral ventriculomegaly: enlargement of lateral ventricles, common fetal neurological finding.
- Prevalence: Up to 1% of fetal ultrasound scans.
- Importance: Leading cause for fetal neurological consultation.
Definition and Classification
Measurement:
- Lateral ventricular atrium diameter on axial ultrasound view.
- Normal ventricular diameter stable at ~6–7 mm between 14 weeks and term.
- Ventriculomegaly diagnosed when ventricular atrium measures ≥10 mm.
Severity Classification:
- Mild Ventriculomegaly: 10–12 mm
- Moderate Ventriculomegaly: 12–15 mm
- Severe Ventriculomegaly: >15 mm (less common)
Laterality:
- Unilateral vs. bilateral
- Symmetrical vs. asymmetrical
Course:
- Transient: spontaneously resolves
- Stable: no significant change
- Progressive: increases over time
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