Back to Pegasus definition listing Choose a year from the dropdown to view that year's definition 2007 2011 2009 2007 Traumatic brain injury Date: April 2007 Definition: Death to brain tissue due to traumatic injury resulting in permanent neurological deficit with persisting clinical symptoms. Definition update history: Traumatic brain injury May 2011 Traumatic brain injury July 2009 Traumatic brain injury April 2007 Share this by email Back to Pegasus definition listing