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HealthBeat Brain Injuries

This handout photo, taken in Aug. 2011, provided by UPMC, shows Dr. David Okonkwo of the University of Pittsburgh Medical Center examining Daniel Stunkard. The soldier on the fringes of an explosion. The survivor of a car wreck. The football player who took yet another skull-rattling hit. Too often, only time can tell when a traumatic brain injury will leave lasting harm _ there's no good way to diagnose the damage. Now scientists are testing a tool that promises to light up breaks that these injuries leave in the brain's wiring, much like X-rays show broken bones. Stunkard suffered a traumatic brain injury that left him with limited use of his left arm and hand. (AP Photo/UPMC)