Spetzler-Martin grading scale20
| Characteristic | Score | |
|---|---|---|
| Grade = total of scores. *Eloquent: sensorimotor, language and visual cortex; hypothalamus and thalamus; internal capsule; brainstem; cerebellar peduncles; and deep cerebellar nuclei. †Superficial: cortical venous system and cerebellar hemispheric veins (that drain directly into the straight or transverse sinuses). | ||
| Size of AVM | ||
| Small (<3 cm) | 1 | |
| Medium (3–6 cm) | 2 | |
| Large (>6 cm) | 3 | |
| Eloquence of adjacent brain* | ||
| Not eloquent | 0 | |
| Eloquent | 1 | |
| Pattern of venous drainage† | ||
| Superficial only | 0 | |
| Deep | 1 | |