With perhaps billions of dollars at stake, a hearing Tuesday over concussion litigation filed against the NFL promises to be a contest between legal lions.

About 4,200 former players have sued the league. Some suffer from dementia, depression, Alzheimer's disease and other neurological problems. Others simply want their health monitored.

And a small number, including Ray Easterling and 12-time Pro Bowler Junior Seau, committed suicide after long downward spirals.