MRI
Coronal T2
Axial T2
Axial MRA
Axial MRA
Axial MRA
Axial MRA
Proptosis of the left globe associated with asymmetrical enlargement of the left superior ophthalmic vein and distended veins adjacent to the lateral wall of the left cavernous sinus and overlying the left temporal lobe adjacent to the greater wind of sphenoid including the inferior anastomotic vein of Labbé. Note signal within these veins on the TOF MRA indicating arterialization of flow indicative of an A-V fistula with origin form a small branch of the cavernous internal carotid artery (arrow).