A brain disorder involving a collection of blood in the space between the inner and the outer membranes covering the brain.
Symptoms usually develop within a short time after a head injury .
The head injury could be as obvious as a traumatic accident or as trivial as a minor bump to the head. Cerebral edema further increases the intracranial pressure. Subdural hematoma often develops as a complication after a head injury. Acute subdural hematoma progresses rapidly, with symptoms usually appearing within 24 hours of the injury. Rapid deterioration occurs thereafter.