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Mild head injury in children is increasingly seen as different from adult traumatic brain injury (TBI) in its likely causes and in children's lesser skull thickness and neck strength, susceptibility to white-matter injury, and immature excitatory amino-acid neurotransmission. These investigators gave diffusion tensor imaging (DTI) and neuropsychological testing to 15 patients (14 boys; mean age, 13.5) with a mild TBI (defined as brief loss of consciousness; Glasgow Coma Score, 13–15; altered mental status at time of injury; and brief post-traumatic amnesia). Evaluations occurred about 2 weeks after injury. Fifteen age- and education-matched healthy controls also underwent DTI. Eleven patients and 12 controls had a second evaluation at an av…