Penetrating injuries in TBI involve?

• A. Direct damage to brain tissues and potential remote damage due to shock waves
• B. Injury to skull only
• C. Vascular tearing without brain injury
• D. Diffuse axonal injury only

Answer: (A)

Penetrating brain injuries cause direct disruption of brain tissue along the path of entry, producing focal damage such as contusions and lacerations, hemorrhage, and disruption of neural pathways at and near the trajectory. The energy of the penetrating object can also generate remote or secondary injury through shock waves or cavitation, injuring tissue away from the direct tract. So the injury isn’t limited to the skull or to vascular tearing without brain involvement, and it isn’t confined to diffuse axonal injury, which is more typical of nonpenetrating, acceleration injuries.