This is a hematoma that forms under the bones of the skull, including the meninges of the brain. These hematomas usually occur following a fracture of the skull bones and are usually due to bleeding of the arteries running between the meninges and the bone, in the fracture area. The diagnosis is made by cerebral CT. It is more common in young people. If not diagnosed and operated on immediately, this can be fatal. The symptoms include severe headache, vomiting, drowsiness, loss of consciousness, neurological deficit (weakness of one side of the body), and after their onset, symptoms usually progress rapidly. If diagnosed early, symptoms are relieved via a simple craniotomy, which has a very good prognosis.