It is a very severe brain injury that typically causes unconsciousness, and it is fatal in about 50% of cases.Ĭhronic subdural hematoma - Unlike the acute form, this type of subdural hematoma usually develops gradually because the bleeding inside the skull is less dramatic, and the hematoma can accumulate in several small, separate episodes of bleeding. ![]() 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). The hematoma can expand within the skull and press on the brain, causing death.Īcute subdural hematoma - In this injury, a blood vessel tears, and blood collects between the dura and the surface of the brain. 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. In most cases, a skull fracture causes a bruise (contusion) on the surface of the brain under the fracture.Įpidural 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. 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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