What is chronic traumatic encephalopathy?

Published On: May 06 2012 04:48:36 PM PDT   Updated On: Apr 27 2016 12:43:58 PM PDT

Here is an explainer about CTE -- the progressive brain disease that is at the center of a debate between retired athletes and multiple sports leagues.

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Mark Wilson/Getty Images

The NFL Players Association initially refused to pay Mackey a disability income due to there not being a proven link between brain injury and playing football. The league and the NFL Players Association have responded with the "88 plan" –- named after Mackey's number.


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