<prompt> A young man following RTA presented with proptosis and pain in the right eye after four days. On examination, there is a bruise on the forehead and right eye. What is the diagnosis -Cavernous sinus thrombosisInternal carotid artery aneurysmCarotico-cavernous fistulaFracture of sphenoid  <response>: Common causes of proptosis associated with craniofacial trauma are:-1 Carotid-cavernous fistulaii Retrobulbar hematomaiii Superior orbital fissure and orbital apex syndromeRare causes are:-Cavernous sinus thrombosisSubperiosteal hematomaSo, amongst the given options carotico-cavernous fistula is the only common cause.Cavernous sinus thrombosis may also occur after trauma. But, trauma is a very rare cause of CST. It usually develops as complication of extension of infection from the adjacent sinus, teeth, ear, nose etc. 