CTE CTE

John Castello decided to stop playing football when he learned about the risks of brain injury. Dave Marmarelli/DGM Photography hide caption

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Dave Marmarelli/DGM Photography

The Impact Of 'Concussion': High School Football Player Changes Course

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The family of Derek Boogaard, who died in 2011, has sued the NHL, accusing the league of negligently causing his death. Ann Heisenfelt/AP hide caption

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Ann Heisenfelt/AP