It is a very severe brain injury that typically causes unconsciousness, and it is fatal in about 50% of cases. Acute subdural hematoma develops rapidly, most commonly after serious head trauma caused by an assault, car accident, or fall. This can happen when the head is hit or when a sudden stop causes the head to move violently forward and back (whiplash). Acute subdural hematoma - In this injury, a blood vessel tears, and blood collects between the dura and the surface of the brain. The hematoma can expand within the skull and press on the brain, causing death. This collection of blood is called a hematoma. As the injured vessel bleeds, blood collects in the space between the skull and the dura, the outermost of the three membranes that cover the brain. Epidural hematoma - This is a very serious form of bleeding that happens when one of the blood vessels under the skull is torn during an injury.In most cases, a skull fracture causes a bruise (contusion) on the surface of the brain under the fracture. This is called a depressed skull fracture. In some cases, the skull is dented inward so that fragments of shattered bone are pressed against the surface of the brain. Skull fracture - A skull fracture is a crack or break in one of the skull's bones.Trauma to the head can cause several types of head and brain injuries, also called traumatic brain injury (TBI).
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