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AVM – Spetzler-Martin Classification — SCE Neurology MCQ

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HardCerebrovascular DiseaseAVM – Spetzler-Martin ClassificationSCE Neurology

Angiography shows a 2.8-cm AVM in primary motor cortex with both superficial and deep venous drainage. What is its Spetzler–Martin grade?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: D — Grade III: one point for each component

Explanation lettering: E = shown as A · A = shown as B · B = shown as C · C = shown as E

D is correct. A nidus under 3 cm scores 1; eloquent motor cortex scores 1; any deep venous drainage scores 1, even when superficial veins are also present. Total 3 gives grade III. Presentation, age, feeding-artery number and flow do not enter the original Spetzler–Martin score.

Reference: NHS England AVM stereotactic-radiosurgery policy: https://www.england.nhs.uk/commissioning/wp-content/uploads/sites/12/2013/10/d05-p-c.pdf