In this image take from video shot on Wednesday, Jan. 25, 2012, Tony Dorsett shows images from a nuclear scan done on his brain, which he says show damage from repeated blows to the head while he was playing in the National Football League, during an interview in his suburban Dallas home. Dorsett, 57, is one of at least 300 former players suing the NFL, claiming the NFL pressured them to play with concussions and other injuries and then failed to help them pay for health care in retirement to deal with those injuries. (AP Photo/Martha Irvine)

Associated Press
In this image take from video shot on Wednesday, Jan. 25, 2012, Tony Dorsett shows images from a nuclear scan done on his brain, which he says show damage from repeated blows to the head while he was playing in the National Football League, during an interview in his suburban Dallas home. Dorsett, 57, is one of at least 300 former players suing the NFL, claiming the NFL pressured them to play with concussions and other injuries and then failed to help them pay for health care in retirement to deal with those injuries. (AP Photo/Martha Irvine)
In this image take from video shot on Wednesday, Jan. 25, 2012, Tony Dorsett shows images from a nuclear scan done on his brain, which he says show damage from repeated blows to the head while he was playing in the National Football League, during an interview in his suburban Dallas home. Dorsett, 57, is one of at least 300 former players suing the NFL, claiming the NFL pressured them to play with concussions and other injuries and then failed to help them pay for health care in retirement to deal with those injuries. (AP Photo/Martha Irvine)
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