What is chronic traumatic encephalopathy?

POSTED: 04:48 PM PDT May 06, 2012    UPDATED: 01:21 PM PST Nov 25, 2015 

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.

John Mackey
10 / 19

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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