Case challenge · Imaging / Fetal medicine / Neurointervention · teaching

Vein of Galen Aneurysmal Malformation (VGAM) Fetal MRI · case challenge

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← View the full flowchartBased on Fetal neurovascular MRI

Case #1Imaging / Fetal medicine / Neurointervention

📋 Case data

Diagnosis + heart failure/brain injury prognostic markersConfirmed VGAM, no heart failure/brain injury, normal cardiac function

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Step 1 / 1 · Diagnosis + heart failure/brain injury prognostic markers

Diagnosis confirmation + heart failure/brain injury prognostic markers (fetal MRI)?

💡 VGAM = a choroidal-type AVM (6–11 weeks), arteriovenous fistulas draining into the median prosencephalic vein of Markowski (precursor of the vein of Galen), causing a dilated midline venous sac. US: midline anechoic/cystic mass (behind the third ventricle, below the CC/CSP) + color Doppler high-flow turbulence. Fetal MRI: a T2 flow-void midline tubular/cystic structure (behind the third ventricle) + drainage into a dilated straight/falcine sinus + surrounding flow voids.

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.