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Classic Spetzler-Martin grading of AVM.
| Size | Eloquent* Cortex | Venous drainage |
|---|---|---|
| < 3 cm (1) | No (0) | Superficial (0) (All cortical) |
| 3 - 6 cm (2) | Yes (1) | Deep (1) |
| > 6 cm (3) |
Note. Summation of characteristics of a particular AVM (numbers in parentheses) determines grade and estimates surgical risk.
Eloquent cortex constitutes sensorimotor, language, visual cortex as well as internal capsule, thalamus, hypothalamus, cerebellar peduncles, brainstem, deep cerebellar nuclei.
