Other genetic variants described as frequently linked with cerebral arteriovenous fistulas and VGAMs include RASA1 variants, associated with Capillary Malformation—Arteriovenous Malformation 1 (CM-AVM 1) or with Rendu-Osler-Weber disease (Hereditary Hemorrhagic Telangiectasia or HHT) (4–6). This evidence concerns the gene RASA1 and hereditary hemorrhagic telangiectasia.