Traumatic Brain Injury (TBI) is defined as which?

• A. Brain Injury From External Force
• B. Degenerative Brain Disease
• C. Injury To Brain From Internal Bleeding Only
• D. Infection Of Brain Tissue

Answer: (A)

Traumatic Brain Injury is defined by damage to the brain caused by external mechanical force. This means an outside event—such as a blow to the head, a fall, a vehicle crash, or a blast—that transfers energy to the brain and disrupts its function. The other options describe conditions that are not caused by external trauma: a degenerative brain disease is a progressive non-traumatic process; injury from internal bleeding only is not the triggering mechanism of TBI (though bleeding can occur as part of the injury); and infection of brain tissue is an infectious, not traumatic, condition. So the defining feature is injury to the brain resulting from external force.