Chronic extradural haematoma: a late complication of head injury.

Three cases of chronic extradural haematoma are presented. The patients who were admitted with neurological signs, were fully conscious at the time of diagnosis. They were operated on 9, 14 and 29 days after the initial trauma. The necessity for adopting a generally accepted chronological criterion of chronicity for extradural haematoma is emphasized. A distinction between conscious and comatose patients with chronic extradural haematoma is made.