<prompt> Most commonly employed treatment for coivocavernous fistula nowadays is :Ballon embolizationLigation of internal aeryNo treatment availableFistulectomy  <response>: A i.e. Ballon embolization Treatment of carotid-cavernous fistula is detachable balloon occlusion balloon embolizationQ 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 dt involvement of 6t nerve and raised intraocular pressure is also associated. 