Frontotemporal dementia

Seventy-five former players are suing the National Football League, claiming the league intentionally withheld knowledge of the damaging effects of concussions for 90 years. The plaintiffs claim that "the NFL knew as early as the 1920s of the harmful effects on a player's brain of concussions; however, until June of 2010 they concealed these facts from coaches, trainers, players and the public."