Traumatic subdural hygroma in adults.

The authors review 25 cases of post-traumatic subdural hygroma in adults and report the findings of computer tomography in 4 cases. There was marked diversity in the severity of injury and in chronicity. The site of the lesion was consistently delineated by angiography, but preoperative differentiation from subdural hematoma was possible only with computed tomography. The mortality was 28%. Good recovery occurred in 48%. The prognosis was best among younger patients with subacute or chronic lesions.