Posterior fossa ganglioglioma--an unusual cause of hearing loss.

Intracranial or spinal gangliogliomas of the CNS are rare tumours. Although several cases have been reported over the years, controversy still remains as to their origin, treatment and prognosis. A case of an eight-year-old girl with a ganglioglioma in the cerebellum with extension into the cerebello-pontine angle is described. The histological basis of the diagnosis is discussed and a review of the literature is presented.