Narbonne takes on View Parkin in the L.A. City Section Girls Basketball Open Division Quarterfinal in Los Angeles, CA. Thomas R. Cordova/Courtesy of Daily Breeze hide caption

itoggle caption Thomas R. Cordova/Courtesy of Daily Breeze

High school athlete Graham Hill, number 50, suffered a concussion in 2013 while playing football at Trinity Christian Academy in Addison, Texas. Courtesy of Jeffrey McWhorter hide caption

itoggle caption Courtesy of Jeffrey McWhorter

The Coachella Valley High School mascot gives the thumbs up at a 2010 football game. Image courtesy of MyDesert.com. Jay Calderon/Courtesy of The Desert Sun hide caption

itoggle caption Jay Calderon/Courtesy of The Desert Sun