Incidental Discovery of a Dural Arteriovenous Fistula in a Patient with Activated Protein C Resistance

Summary: A dural arteriovenous fistula was discovered incidentally in a 58-year-old man with activated protein C resistance who underwent routine outpatient cerebral an-giography for workup of multiple intracranial aneurysms. The development of a dural arteriovenous fistula (DAVF) is a well-recognized sequela of dural sinus thrombosis. Among the most common preexisting conditions for development of sinus thrombosis and subsequent fistula formation are trauma, infection with thrombophlebitis (often related to middle ear or mastoid sepsis), severe dehydration, and thrombo-philic states (1). Among the thrombophilic conditions, activated protein C resistance (APCR) has received relatively little attention in the literature in relation to DAVF