title: Rarest of the rare: Chordoid glioma infiltrating the optic chiasm.
abstract: BACKGROUND
  Chordoid glioma is a rare brain tumor typically located within the anterior third ventricle. It is a well-circumscribed, non-infiltrative tumor that grows as a mass within the ventricle.
  
  
  METHODS
  We present the case of a 50-year-old woman with a chordoid glioma located in the anterior third ventricle. Unusually, MRI revealed an enlarged optic chiasm. Histological sampling of the chiasm revealed tumor invasion.
  
  
  CONCLUSIONS
  Involvement of the optic apparatus is generally thought to be an imaging feature that can be used to distinguish chordoid gliomas from optic/hypothalamic gliomas. This case provides the first reported exception to this dogma.
authors.affiliation: Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montreal, Quebec, Canada.
authors.forename: Qasim S
authors.initials: QS
authors.lastname: Al Hinai
authors.forename: Kevin
authors.initials: K
authors.lastname: Petrecca