This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
Pulsatile exopthalmus is seen in 
Select and explain. 
A. Wyburn Mason syndrome, B. Caroticocavernous fistula, C. Both, D. None of the above
C: Both
Answer: C: Both 
Explanation: Wyburn Mason syndrome/Cerebrofacial aeriovenous metameric syndrome (CAMS)is Retinocephalic vascular Malformation with po-wine stain, pulsatile exophthalmos, and seizures. Carotico Cavernous fistulas with basal skull fractures also show pulsatile exophthalmos with a prominent superior ophthalmic vein. MRI axial image showing proptosis of right eye ball with prominent superior opthalmic vein (arrow) as seen in Coratico-cavernous fistula.