What is chronic traumatic encephalopathy?

Published On: May 06 2012 04:48:36 PM PDT   Updated On: Jul 08 2014 05:40:55 AM PDT

The NFL has reached a preliminary settlement in a lawsuit filed over player concussions. Find out more about chronic traumatic encephalopathy, the disease several former NFL pros claim they are now suffering from due to hits on the field.

John Mackey
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John Mackey, one of NFL football's great tight ends, died in 2011 of frontotemporal dementia, a syndrome similar to CTE that involves degeneration of the brain.

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