title: Unilateral papilledema caused by a fronto-temporo-parietal arachnoid cyst.
abstract: OBJECTIVE
  To report a case of unilateral papilledema caused by an arachnoid cyst.
  
  
  METHODS
  Interventional case report.
  
  
  RESULTS
  A 36-year-old woman presented with unilateral papilledema in the left eye. Magnetic resonance imaging (MRI) of the brain demonstrated a large fronto-temporo-parietal arachnoid cyst in the left hemisphere. The papilledema resolved after placement of a cysto-peritoneal shunt that drained the cerebrospinal fluid directly from the arachnoid cyst into the peritoneum.
  
  
  CONCLUSIONS
  Papilledema caused by increased intracranial pressure is usually bilateral; unilateral papilledema is possible under special anatomical circumstances.
authors.affiliation: Department of Opthalmology, Augenflinik, Kantonsspital Aarau, CH 5001 Aarau, Switzerland. Killer@KSA.ch
authors.forename: H E
authors.initials: HE
authors.lastname: Killer
authors.forename: J
authors.initials: J
authors.lastname: Flammer
mesh_terms: D000328:Adult; D016080:Arachnoid Cysts / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D005260:Female; D005625:Frontal Lobe / Q000473:pathology*; D006801:Humans; D007427:Intracranial Pressure; D008279:Magnetic Resonance Imaging; D010211:Papilledema / Q000175:diagnosis / Q000209:etiology*; D010296:Parietal Lobe / Q000473:pathology*; D013702:Temporal Lobe / Q000473:pathology*; D017287:Ventriculoperitoneal Shunt