CTE is rare in brains of deceased service members, study finds — NPR

In contrast, a 2017 study of brains from deceased college and NFL football players found that 87% had signs of CTE. Even service members who had experienced concussions from bomb blasts were unlikely to develop CTE. Just 6.7 percent of the brains from 45 people exposed to blasts were diagnosed with the condition.
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Our traumatic brain injury tends to take a different look than that of football players.