This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Most commonly employed treatment for coivocavernous fistula nowadays is : \nSelect and explain. \nA. Ballon embolization, B. Ligation of internal aery, C. No treatment available, D. Fistulectomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Ballon embolization Treatment of carotid-cavernous fistula is detachable balloon occlusion (balloon embolization)Q of fistula or feeding vessel by transfemoral aery approach It is an abnormal communication between internal carotid aery & cavernous sinus It can be classified on the basis of (a) aetiology (spontaneous and traumatic) (b) haemodynamics (high and low flow) (c) anatomy (direct and indirect) Direct Carotid Cavernous Fistula - Representing 70-90% of all cases - Are high flow shunts - Blood passes through a defect in the wall of the intercavernous poion of the internal carotid aery - Trauma is responsible for 75% of all cases of direct fistula - Presents with classical triad of pulsatile proptosis, conjuctival chemosis and flushing noise in head after head injury Opthalmoplegia mostly d/t involvement of 6t nerve and raised intraocular pressure is also associated.', 'role': 'assistant'}]