<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>: Digital subtraction angiography is the investigation of choice in this case,Digital subtraction angiography DSA is a fluoroscopy technique used in interventional radiology to clearly visualize blood vessels in a bony or dense soft tissue environment 