title: Optic tract compression from dolichoectatic basilar artery.
abstract: OBJECTIVE
  To report a case of optic tract compression caused by a dolichoectatic basilar artery.
  
  
  METHODS
  Observational case report.
  
  
  METHODS
  A 74-year-old man with progressive loss of vision over 13 years and no other neurologic signs or symptoms was found to have bilateral optic nerve head pallor and a left homonymous hemianopia.
  
  
  RESULTS
  Magnetic resonance imaging and angiography revealed a severe dolichoectatic basilar artery compressing the right optic tract.
  
  
  CONCLUSIONS
  Basilar artery dolichoectasia may rarely cause compression of the optic tract and progressive visual loss.
authors.affiliation: Bascom Palmer Eye Institute, Miami, Florida 33163, USA.
authors.forename: M F
authors.initials: MF
authors.lastname: Guirgis
authors.forename: B L
authors.initials: BL
authors.lastname: Lam
authors.forename: S F
authors.initials: SF
authors.lastname: Falcone
mesh_terms: D000368:Aged; D001488:Basilar Artery / Q000473:pathology*; D006423:Hemianopsia / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications* / Q000175:diagnosis; D008279:Magnetic Resonance Imaging; D008297:Male; D009408:Nerve Compression Syndromes / Q000175:diagnosis / Q000209:etiology*; D009901:Optic Nerve Diseases / Q000175:diagnosis / Q000209:etiology*; D014792:Visual Acuity; D014794:Visual Fields; D014795:Visual Pathways