Final answer:
An epidural hematoma is a collection of blood between the brain and the skull, typically caused by a head injury. Symptoms of an epidural hematoma may include loss of consciousness, severe headache, confusion, nausea and vomiting, and weakness on one side of the body.
Step-by-step explanation:
An epidural hematoma is a collection of blood that forms between the brain and the interior of the skull, usually as a result of a head injury. It occurs when there is bleeding from a damaged blood vessel that lies immediately deep to the pterion, which is a clinical landmark on the lateral side of the head. Symptoms of an epidural hematoma may not be immediate, but can include a loss of consciousness followed by a period of lucidity, severe headache, confusion, nausea and vomiting, and weakness or numbness on one side of the body.