Prevalence and Associations of Dural Arteriovenous Fistulae in Cerebral Venous Thrombosis: Analysis of ACTION-CVT

Dural arteriovenous fistulae (DAVFs) represent approximately 10% of all intracranial vascular malformations 1 with an incidence of 0.16-1.04per 100,000 person-years. 2,3Prior studies identified an association between cerebral venous thrombosis (CVT) and DAVF although the direction of causality remains uncertain.In one series, 39% of DAVF patients had a CVT identified within an adjacent or downstream sinus, 4 and patients with DAVF have a higher prevalence of thrombophilia, implicating thrombosis in its pathogenesis. 5We aimed to determine the prevalence and associated factors of DAVF in a large multicenter study of treated CVT.The Anticoagulation in the Treatment of Cerebral Venous Thrombosis (ACTION-CVT) study was a multicenter retrospective study comparing outcomes among CVT patients treated with a vitamin K antagonist versus direct oral anticoagulants. 6The study in-