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

Anteroposterior (A) and lateral (B) angiograms, obtained via left common carotid artery injection, and lateral angiogram (C), obtained via left external carotid artery injection, show enlarged external carotid artery branches and an early draining vein that was confirmed during selective injection of the left external carotid artery. Middle meningeal artery, posterior branch (small arrows); occipital artery (arrowheads); early draining vein (curved arrows).