Acute spontaneous subdural hematoma in a teenager.

A teenager with a history of sudden onset of headache and vomiting is described. Computed tomography revealed an acute subdural hematoma in the right temporoparietal region, causing marked compression of the right ventricular system and a shift of midline structures to the left. No operation was carried out because the symptoms and neurological signs were slight enough to allow monitoring by means of close clinical and neuroradiological investigations. Within 18 days the hematoma resolved spontaneously and completely. There was no history of trauma or any objective sign of trauma about the face or head, and radiography of the skull showed no fracture. We are not aware of any other report of a spontaneous subdural hematoma which did not require surgery. This feature makes our case unique. In addition, comparable cases in the literature are reviewed and the etiological possibilities of spontaneous subdural hematoma are discussed.