症例 challenge · Imaging / Fetal medicine / Prenatal diagnosis · teaching

Fetal Ventriculomegaly MRI · case challenge

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Case #1Imaging / Fetal medicine / Prenatal diagnosis

📋 Case data

Lateral ventricular atrial width (SMFM)13–15 mm (moderate)

Data is taken from this pathway's reviewed node text. Work through the pathway step by step.

Step 1 / 1 · Lateral ventricular atrial width (SMFM)

Lateral ventricular atrial width (axial thalamic plane, inner-to-inner)?

💡 Atrium ≥10 mm (axial at the thalamus/cavum septi pellucidi, measured inner edge) = ventriculomegaly. VM is a sign, not a diagnosis. Carefully assess associated anomalies (agenesis of the corpus callosum/Dandy-Walker/NTD/migration) + chromosomes (karyotype/microarray) + TORCH (CMV/toxoplasma); fetal MRI for parenchyma and associated CNS anomalies (moderate/severe or when ultrasound is limited). MRI measurements differ from ultrasound by about 2 mm. A dangling choroid plexus sign may be seen in severe cases.

For teaching. Decisions and their basis are taken from this site's reviewed care pathways; for licensed clinicians/trainees, this does not replace clinical judgment or local protocols.