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The same dementia-like disease found in the brain tissue of several National Football League players has shown up in the brains of four U.S. veterans exposed to improvised explosive devices and other head trauma, according to new research.

Latest Stories Andrew Lawrence: League focusing on mental health, but players must buy inupdated: Fri May 11 2012 16:11:00

When Dr. Yolanda Bruce Brooks first set foot in an NFL locker room 16 years ago, the Cowboys players inside had little idea what to make of her. A woman in their inner sanctum, they deduced, could be only one of three things: a reporter, a jock sniffer or worse -- management. What she was, in fact, was the Cowboys' new psychologist, coming to Valley Ranch at the behest of Ring of Honor inductee turned team consultant Calvin Hill to help bring calm to a roster whose taste for drugs and depravity and disrespect for authority seemed like symptoms of deeper issues.

NFL takes good first step to protect playersupdated: Tue Apr 10 2012 08:02:00

In the NFL, controlled violence is, and always will be, an essential part of the sport. As fans, we have no problem with coaches telling players to run hard, hit hard and tackle hard, because we know that we can't take that kind of contact and tough physicality out of football. Albert Chen: Early returns are positive for Cespedes, Hughes, Crawfordupdated: Thu Mar 15 2012 16:18:00

The early word on Yoenis Cespedes is in. "He's the real deal," says a scout who has seen him this spring. "Very mature approach. Very professional. And he can hit. He's the best hitter on the A's right now. Oakland made a great gamble." Mel Antonen: Span just latest Twins star to battle effects of a concussionupdated: Fri Feb 10 2012 15:26:00

Thanks to what seems like a never-ending battle with a foggy brain, outfielder Denard Span breaks away from his routine winter workouts one day a week for special treatments that he hopes fix concussion symptoms. Ben Glicksman: A Q&A on concussions in H.S. football with Dr. Sanjay Guptaupdated: Fri Jan 27 2012 11:23:00

On Jan. 29, CNN will debut Big Hits, Broken Dreams, a documentary exploring concussions in high school football.'s Ben Glicksman talked with Dr. Sanjay Gupta, CNN chief medical correspondent and practicing neurosurgeon, about his findings and what parents, coaches and athletes need to know to try to protect themselves.

Big hits, broken dreamsupdated: Fri Jan 27 2012 07:04:00

The sport of tackle football can be very dangerous. Can teams play safely and still win? Dr. Sanjay Gupta reports.

Brain bank examines athletes' hard hits updated: Fri Jan 27 2012 07:04:00

For 17-year-old Nathan Stiles, his senior year was supposed to be the best yet.

Former NFL players sue league over head injuriesupdated: Thu Dec 22 2011 17:30:00

Jamal Lewis, Dorsey Levens and two other former NFL players have filed a lawsuit accusing the National Football League of misleading them and failing to protect them against on-the-field brain injuries they say caused health problems years after they retired.

Ex-players sue NFL over concussionsupdated: Thu Dec 22 2011 17:30:00

Former Detroit Lion Ryan Stewart is one of the plaintiffs in a lawsuit alleging NFL negligence in regard to concussions. Mel Antonen: Can Dan Duquette restore the glory days for the Baltimore Orioles?updated: Wed Nov 09 2011 11:19:00

BALTIMORE -- Dan Duquette spent over two decades in the front offices of major league baseball teams, culminating with his role as Red Sox general manager in which he helped assemble the key pieces of what would become Boston's 2004 Curse-busting World Series title team.

Tackle the concussion epidemicupdated: Wed Oct 05 2011 15:39:00

It's football season: From Pop Warner, Young American Football League and other children's football leagues; from high school to college and the pros, football is the name of the game.

Former NFL players: League concealed concussion risksupdated: Wed Jul 20 2011 19:16:00

Seventy-five former professional football players are suing the National Football League, saying the league knew as early as the 1920s of the harmful effects of concussions on players' brains but concealed the information from players, coaches, trainers and others until June 2010.

Film aims to show football's culture of playing despite concussionsupdated: Fri Jul 01 2011 12:24:00

Ellis Hobbs likened his spine to a jelly doughnut, saying that one of his vertebrae "squeezed out the back end" when he took a jolt to the head during a kick return in 2009.

Steve Atwater on football injuriesupdated: Fri Jul 01 2011 12:24:00

Once one of the NFL's most feared safeties, Steve Atwater knows something about hard hits. He discusses the topic of concussions with Patrick Snell.

Duerson asked for brain to be studiedupdated: Tue May 03 2011 07:53:00

CNN's Dr. Sanjay Gupta speaks with the family of a former NFL player who committed suicide.

Duerson brain tissue analyzed: Suicide linked to brain diseaseupdated: Tue May 03 2011 07:53:00

His was a suicide with a macabre twist. In February, former Chicago Bears safety David Duerson shot himself in the chest, but not before leaving behind a note requesting his brain be studied for evidence of a disease striking football players.

Ex-Falcons lineman had brain disease linked to concussionsupdated: Fri Apr 01 2011 11:48:00

Former NFL lineman Shane Dronett's transformation from an affable prankster, quick to flash a wry smile, to a person who was often frightened -- and frightening -- was subtle at first.

Vision test offers rare, early glimpse of concussionupdated: Wed Feb 02 2011 21:31:00

For an injury that is largely invisible, it is no small irony that a new test to detect concussion involves the eyes.

NFL's dirty little secret: Players sufferupdated: Tue Jan 25 2011 12:20:00

The business leaders of the National Football League used to have a secret.

2010: Playing despite concussion riskupdated: Tue Jan 25 2011 12:20:00

Calvin Lowe suffered a concussion playing football, but he won't walk away from the gridiron. CNN's Sarah Hoye reports.

New Jersey law sidelines student athletes who may have a brain injuryupdated: Wed Dec 08 2010 09:10:00

New Jersey Gov. Chris Christie is playing defense against brain injuries for student athletes.

Warner: 'Something has to change'updated: Wed Dec 08 2010 09:10:00

Former NFL quarterback Kurt Warner talks to Dr. Sanjay Gupta about the league and players' attitudes on concussions. Bouchard cleared for return to Wild after more than yearupdated: Tue Nov 30 2010 17:38:00

ST. PAUL, Minn. (AP) -- Center Pierre-Marc Bouchard is set to suit up for the Minnesota Wild for the first time in more than a year.

Warner: Playing through concussion 'part of the game'updated: Fri Nov 26 2010 15:44:00

Former NFL quarterback Kurt Warner knows how it feels when a 250-pound defender is charging after him on the playing field. He knows the frenzied scramble, the attempt to evade a defender. Warner also knows, when none of that works, how it feels to have 250 pounds of flesh crushing him.

Brain injuries steal player's memoryupdated: Wed Nov 24 2010 10:05:00

CNN's Dr. Sanjay Gupta reports on a young athlete who had his memory stolen by multiple concussions.

Ex-NFL stars after concussion: Lives unraveledupdated: Wed Nov 24 2010 10:05:00

Today is a rare day. Fred McNeill is animated, beaming. Sunlight glances over his face as he relives the glory days 30 years ago when he was a professional football player for the Minnesota Vikings. Grant Wahl: Effect of concussions on soccerupdated: Wed Oct 27 2010 16:53:00

When Taylor Twellman won Major League Soccer's MVP award in 2005, he threw his head at balls in the penalty box with the force of a bird smacking into a window. That's how the U.S. and New England Revolution forward scored 101 goals in eight MLS seasons -- and how his playing career took an irretrievable turn on Aug. 30, 2008. Jim Kelley: NHL rules video sets higher standard, Price takes heat, more notesupdated: Thu Sep 23 2010 17:08:00

The NHL this week released a video (below) to illustrate the parameters of a new rule regarding illegal hits to the head. It also tacked on a series of calls that will be made for other hits, illegal checks and contact near the end boards.

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