What is chronic traumatic encephalopathy?

Published On: May 06 2012 07:48:36 PM EDT   Updated On: Nov 25 2015 04:21:07 PM EST

With Frank Gifford's family saying the football commentator and NFL great suffered from chronic traumatic encephalopathy before his August death, find out more about the progressive brain disease.

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San Francisco 49ers linebacker Chris Borland announced his retirement from football on March 16, 2015, due to worries about head trauma. The team's leading tackler in the 2014-15 season as a rookie, Borland told ESPN that even though he was diagnosed with only two concussions, both while in high school, he will not change his mind about retiring.


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