title: Case report: optic disc edema without hydrocephalus in acoustic neuroma.
abstract: Traditionally, visual disturbance and optic disc edema are regarded as late manifestations of acoustic neuromas indicating increased intracranial pressure as a result of obstructive hydrocephalus or a sizeable mass lesion. We report the case of a 56-year-old man who presented with visual disturbance and bilateral optic disc edema. Classic features of hydrocephalus were absent. Magnetic resonance imaging showed a large acoustic neuroma. However, there was no ventriculomegaly and at surgery intracranial pressure was normal. We suggest that cerebrospinal fluid protein may have a role in the formation of optic disc edema through a normal pressure communicating type of hydrocephalus. Furthermore, patients with acoustic neuromas and a visual disturbance related to optic disc edema may be inappropriate for treatment with stereotactic radiosurgery and should be offered early surgery to prevent visual deterioration.
authors.affiliation: Department of Neurosurgery, University Hospital of North Staffordshire, Royal Infirmary, Stoke-on-Trent, Great Britain, United Kingdom.
authors.forename: Joseph
authors.initials: J
authors.lastname: Grainger
authors.forename: Palitha S
authors.initials: PS
authors.lastname: Dias