![]() These symptoms generally fall into one of the following categories, and are additional evidence that a mild traumatic brain injury has occurred: It should be recognized that patients with mild traumatic brain injury can exhibit persistent emotional, cognitive, behavioral, and physical symptoms, alone or in combination, which may produce a functional disability. Symptoms of brain injury may or may not persist, for varying lengths of time, after such a neurological event. The above criteria define the event of a mild traumatic brain injury. ![]() In such cases, it is appropriate to consider symptomatology that, when linked to a traumatic head injury, can suggest the existence of a mild traumatic brain injury. Due to the lack of medical emergency, or the realities of certain medical systems, some patients may not have the above factors medically documented in the acute stage. Computed tomography, magnetic resonance imaging, electroencephalogram or routine neurological evaluations may be normal. It excludes stroke, anoxia, tumor, encephalitis, etc. This definition includes: 1) the head being struck, 2) the head striking an object, and 3) the brain undergoing an acceleration/ deceleration movement (ie, whiplash) without direct external trauma to the head.
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