Posterior fossa subdural haematomas.

Traumatic posterior fossa subdural haematomas are rare and, while part of a major head injury, may give little warning of their presence. A definite proportion of cases will be well enough to exhibit progressive and recognizable posterior fossa signs that might include occipital headache, raised intracranial pressure, lateralized cerebellar or brain-stem signs, and a fracture of the occipital bone. These cases will be readily amenable to investigation and cure by evacuation of the causative haematoma.