Definitions for "Closed Head Injury"
impact to the head from an outside force, without any skull fracture or displacement.
The great majority of civilian head injuries are 'closed'. These are injuries in which the head has undergone a rapid change in velocity and has therefore been severely 'shaken about'. It should be distinguished from PENETRATING HEAD INJURY (qv) in which the skull is penetrated by a missile (eg bullet, shrapnel, other flying object).
Damage to the brain that is not accompanied by a penetrating injury (such as a bullet that pierces the skull). CHI usually causes diffuse damage to the brain.
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