Usually results from brain laceration with injury to the small pial veins bridging the subdural space

24-72 hr

Decreased level of consciousness, hemiparesis, unilateral pupil dilation, extraocular eye movement, paralysis, cranial nerve dysfunction


Similar to acute

2-10 days

Similar to acute


Usually occurs in the elderly or in problem drinkers who experience atrophy of the brain; often associated with falls

2 wk or more

Interval when patient appears to recover and then progressive deterioration occurs Drowsiness, inattention, personality changes, headache; progresses to hemiparesis, pupil changes, decreased mental status

862 Subdural Hematoma and brain herniation. A consequence of increased ICP, brain herniation is a life-threatening condition in which brain structures protrude through an opening in the brain cavity.

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