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Spetzler-Martin grading system for brain AVMs
| Graded feature | Points assigned |
|---|---|
| Size of AVM | |
| Small (<3 cm) | 1 |
| Medium (3–6 cm) | 2 |
| Large (>6 cm) | 3 |
| Eloquence of adjacent brain | |
| Non-eloquent | 0 |
| Eloquent | 1 |
| Pattern of venous drainage | |
| Superficial only | 0 |
| Deep | 1 |
Total grade = size + eloquence + venous drainage.
