Abstract
Arteriovenous malformations (AVMs) are complex vascular lesions. The Spetzler-Martin system and Lawton-Young supplementary grading scale are used to categorize AVMs and select patients for surgery. However, organizing AVMs into types and subtypes based on their location in the brain, arterial supply, draining veins, and eloquent structures allows for a unique surgical strategy for each AVM. There are seven AVM types based on their location in the brain: frontal AVMs, temporal AVMs, parieto-occipital AVMs, ventricular or periventricular AVMs, and AVMs in the deep central core, brainstem, and cerebellum. Each type comprises four to six subtypes based on their surgical anatomy, allowing for a tailored surgical approach and resection strategy.