What is chronic traumatic encephalopathy?

POSTED: 4:48 PM PDT May 6, 2012    UPDATED: 5:40 AM PDT July 8, 2014 
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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.