[Contralateral extradural hematoma during evacuation of a previous one].

The development of an extradural hematoma during the evacuation of a traumatic extracerebral hematoma is a very rare event. It occurs in patients with a severe head injury that present with both an extraaxial hematoma and a contralateral skull fracture. Recognition of the significance of a sudden increase in the cerebral tension after hematoma evacuation is the key for a pront diagnosis of the development of a contralateral lesion. We present the case of a patient with a severe head trauma and an extradural hematoma who developed a contralateral extradural hematoma during evacuation of the initial one. The development of a contralateral lesion was suspected by a sudden and unexpected increase in cerebral tension during evacuation of the first hematoma and confirmed by emergency CT scan. We think that the most important pathogenetic mechanisms involved in the development of a contralateral extradural hematoma are the rapid fall of intracranial pressure, the loss of tamponade effect achieved by the energetic use of antiedema measures and the evacuation of the ipsilateral hematoma.