Neuropathologic survey on TBI cases Lead Investigator: Diego Ianco Institution : Uniformed Services University of the Health Scienc E-Mail : diego.iacono.ctr@usuhs.edu Proposal ID : 714 Proposal Description: The main aims for this NACC inquiring and possible future related projects are: a) how many cases with a clinical diagnosis of dementia as well as normal subjects had a history of trauma (of any type) across the entire NACC database. For this part of our project we will try to analyze specific clinical, neuropsych, etc. data to hypothesize specific TBI-related clinico-neuropsych trajectories b) In the second arm of our project we would like to perform an extensive neuropathologic survey (especially looking for CTE pathology) in all dementia+TBI cases vs. dementia-non-TBI (age-matched) vs. controls. For both of our aims any type of traumatic etiology as well as recent and remote TBI cases will be of high value. Also, we propose to analyze cases and brains from both NACC's modules.