A, Carotid-cavernous fistula of the right eye with proptosis due to congested orbital tissue and arterialization of episcleral and conjunctival vessels. B, MRI, coronal view (different patient), showing the dilated superior ophthalmic vein (arrow). Note the enlarged superior rectus levator complex. C, CT angiogram. Intracranial arteries and the superior ophthalmic vein fill at the same time because the vein is arterialized. Blood is seen in the vein during the arterial phase (arrow).