showing if owen had lived another 30 years, his cte would have advanced to the stage shown in dave duerson. during a game, a high school player hit the ground. as he walked to the bench, he complained of severe headache, and then collapsed. he died the following day. examination showed a hemorrhage consistent with early changes of cte. is the youngest player ever diagnosed with changes of cte. i have now examine the brains of 58 individuals with cte found early cte college and high school players. reno cte -- we know cte usually occurs in individuals in their teens and 20's. once triggered, the degeneration progresses slowly to involved widespread the generation of many brain structures. we know the symptoms of cte are subtle and began in mid life, including irritability, depression, suicidal ideation, and memory loss. we know there is a slow deterioration. there are many things we did not understand about cte. we do not understand the exact incident and prevalence of this disorder, even though we clearly understand disease exists and is surprisingly common. what factors determine who will