Spetzler-Martin arteriovenous malformation grading system

The Spetzler-Martin arteriovenous malformation (AVM) grading system allocates points for various features of intracranial arteriovenous malformations to give a grade between 1 and 5. Grade 6 is used to describe inoperable lesions. The score correlates with operative outcome.

Grading

  • size of nidus
    • small (<3 cm) = 1
    • medium (3-6 cm) = 2
    • large (>6 cm) = 3
  • eloquence of adjacent brain
    • non-eloquent = 0
    • eloquent = 1
  • venous drainage
    • superficial veins only = 0
    • deep veins = 1
Eloquence of adjacent brain
  • eloquent brain
    • sensorimotor, language, visual cortex, hypothalamus, thalamus, brain stem, cerebellar nuclei, or regions immediately adjacent to these structures
  • non-eloquent brain
    • frontal lobe, temporal lobe, cerebellar hemispheres