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Military traumatic brain injury (TBI) is complex, often involving both diffuse and focal components. The contribution of each of these types of injury to epileptogenic brain activity and ultimately post traumatic epilepsy (PTE) is unclear, as are the mechanisms underlying this transition. Using a large animal model (pig) with adequate white matter pathways and a gyrencephalic brain, we are comparing these injury phenotypes and their potential contribution to PTE. After injury, we chronically implant high density electrodes in the hippocampus, above the cortex near the site of the focal contusion, and ECoG in the contralateral hemisphere. Pigs are monitored via video and electrophysiology up to nine months post injury, and blood biomarkers are being analyzed throughout in order to evaluate them as potential prognostic measures for the development of PTE.