Chronic extradural hematoma.

Thirty-five patients with late extradural hematomas are described in whom the interval between injury and operation was at least seven days. Interpersonal violence was responsible for the initial injury in about two-thirds of the cases. There was a uniformly favorable outcome in all the cases The mode of presentation, features of the computed tomographic (CT) scans, and the possible mechanism of formation of chronic extradural hematomas are discussed.