338 donated NFL players' brains are giving researchers an unusual window into CTE and chronic brain injury, raising fresh questions about the long-term cost of football

A recent investigation into the brains of deceased former NFL athletes revealed a staggering incidence of chronic traumatic encephalopathy (CTE), found in 93.2% of 338 examined cases. However, the overall prevalence among all players is notably variable, ranging from 18.5% to 98.7% due to the limited number of brain donations.