The NFL's concussion epidemic: Finally, a major breakthrough?

UCLA researchers say they can now use PET scans to identify brain damage in players while they're still alive

"The holy grail": That's how one doctor describes a new technique to diagnose neurodegenerative disease in football players.
(Image credit: Elsa/Getty Images)

The NFL's concussion crisis is a public-relations nightmare for commissioner Roger Goodell. Years of brutal hits can do irreversible damage to the brains of even the toughest athletes, and recent studies have shown that a neurodegenerative disease called chronic traumatic encephalopathy, or CTE, is a major problem for retired football players. But CTE has long been tough to diagnose, as the damaged tissue could only be examined after a player was dead, which, of course, doesn't really help those battling risky symptoms like mood swings and depression. But now, UCLA researchers are pioneering a new technique that would allow doctors to identify CTE's signature while the patient is still very much alive. Here's what you should know about the breakthrough:

First off: What causes CTE, exactly?

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Chris Gayomali is the science and technology editor for TheWeek.com. Previously, he was a tech reporter at TIME. His work has also appeared in Men's Journal, Esquire, and The Atlantic, among other places. Follow him on Twitter and Facebook.