False aneurysm with subdural hematoma and symptomatic vasospasm following head injury.

A rare case of cortical false aneurysm in a subdural hematoma and symptomatic vasospasm following head injury without skull fracture is reported. Angiography led to the correct preoperative diagnosis and successful surgical treatment, although the patient's symptoms of acalculia, agraphia, and astereognosis, mainly due to the vasospasm of the proximal portion of the middle cerebral artery, remained unchanged. The mechanism of such a cortical false aneurysm and symptomatic vasospasm is discussed briefly.