Stereotactic Radiosurgery for Intermediate and High-Grade Arteriovenous Malformations: Outcomes Stratified by the Supplemented Spetzler-Martin Grading System

The Supp-SM grading system was not predictive of outcomes after SRS of intermediate- or high-grade AVM. In a cohort that included a high percentage (47%) of "inoperable" AVMs according to Supp-SM grade (≥ 7), most patients had obliteration after SRS, although there was a high risk of neurological decline.