This grading scale incorporates anatomical features of the AVM to formulate a score between 1 and 5 (40). The higher the score, the higher the risk of operative morbidity and mortality. These predictive data can then be discussed with the family to determine whether operative intervention is desirable.
| Factor | Measurement Parameter | Score |
| Size | ||
| 0-3 cm | 1 | |
| >3 to 6 cm | 2 | |
| >6 cm | 3 | |
| Location | ||
| Noneloquent | 0 | |
| Eloquent | 1 | |
| Deep Venous Drainage | ||
| Not present | 0 | |
| Present | 1 |
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