It is increasingly recognized that moderate to severe traumatic brain injury (TBI) (typically defined as loss of consciousness for >30 minutes1) increases the risk for dementia in older adulthood,2 a conclusion based primarily on epidemiologic research. Whether mild TBI, also called concussion, is associated with increased risk of dementia is less clear, especially because fewer prospective studies have focused on mild TBI.3 Please contact the library to request a copy of this article - http://bit.ly/1Xyazai