A young man following A presented with proptosis and pain in right eye after four days. On examination there is bruise on forehead and right eye. What is the diagnosis -: (A) Cavernous sinus thrombosis, (B) Internal carotid aery aneurysm, (C) Carotico-cavernous fistula, (D) Fracture of sphenoid
Answer is C. Carotid cavernous fistula is an acquired abnormal communication between the carotid aerial system and the venous cavernous sinus . Conjuctival congestion and chemosis is the differentiating feature. Ref : ak khurana 6th edition pg no 416