Cerebral Arteriovenous Malformations: Evaluation and Management

Table 1

Spetzler-Martin Grading Scale for AVMs.

Characteristic	Number of points assigned
Size of AVM
Small (<3 cm)	1 point
Medium (3–6 cm)	2 points
Large (>6 cm)	3 points
Location
Noneloquent site	0 points
Eloquent site*	1 point
Pattern of venous drainage
Superficial only	0 points
Deep component	1 point

*Sensorimotor, language, visual cortex, hypothalamus, thalamus, internal capsule, brain stem, cerebellar peduncles, or cerebellar nuclei.