<prompt> A young adult presents with proptosis and pain in eye after 4 days of trauma to eye. Chemosis, conjunctival congestion and extraocular muscle palsy with inability to move eye are seen.Investigation of choice -MRIDigital subtraction angiographyCTMR angiography  <response>: Information in this question are :-Presentation 4 days after traumaTraumatic proptosis along with chemosis and conjunctival congestionExtraocular muscle palsy ophthalmoplegiaGiven the patients clinical presentation of proptosis with chemosis and conjunctival congestion in the setting of cranio-facial injury, a traumatic carotid-cavernous fistula is suspected.Most likely diagnosis is carotico-cavernous fistula.Selective carotid angiography using digital subtraction techniques is the investigation of choice.Another condition which may present with similar features is CST, but it is very rare after trauma. 