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Eleven patients with a history of mild traumatic brain injury and 10 age- and sex-matched controls underwent sodium MR imaging using a 3T scanner. Higher total sodium concentration in the genu and lower total sodium concentration in the splenium was seen in patients with mild traumatic brain injury compared with controls. The ratio of genu total sodium concentration to splenium total sodium concentration was also higher in patients with mild traumatic brain injury. The total sodium concentration appears to be altered beyond the immediate postinjury phase, and further work is needed to understand the relationship to persistent symptoms and outcome.