Fig. 12 A. A 68-year-old female developed sudden proptosis (over 2–3 minutes), decreased vision, conjuntival injection, chemosis, and restricted motility. B. Multiple corkscrew vessels are seen secondary to engorgement of the epibulbar vessels. C. Axial computed tomography (CT) scan revealed proptosis and enlargement of the extraocular muscles.. D. Axial computed tomography (CT) scan also revealed an enlarged superior ophthalmic vein.