Fig 1. A 52-year-old woman presenting with proptosis and chemosis in the right orbit and 2 months of diplopia resulting from anterior draining DAVFs of the right cavernous sinus. Subtracted maximum-intensity-projection images on 3D dynamic MRA. A and B, Early venous enhancement is demonstrated within the right cavernous sinus and superior ophthalmic vein in the arterial-dominant phase (A) and is more clearly identified in the next phase (B). C, The venous structures are visualized by normal venous return in the arteriovenous phase.