Among 130 patients with post traumatic extradural haematomas treated during the 1979-1984 period, there were 11 patients with multiple extradural haematomas, generally visualized at the first C.T. examination and 5 patients with recurring haematomas. The patients who have just been operated upon must be clinically watched and a new C.T. examination must be made if a deterioration of the patient's condition appeared or if the post operative condition is not that expected after the first C.T.