title: Interhemispheric arachnoid cyst in the elderly: case report and review of the literature.
abstract: BACKGROUND
  Preoperative differential diagnosis of interhemispheric cysts is sometimes difficult.
  
  
  METHODS
  We recently experienced a case of symptomatic interhemispheric arachnoid cyst in a 62-year-old woman. We reviewed interhemispheric arachnoid cysts in the elderly and the management of symptomatic interhemispheric arachnoid cysts in elderly patients. Symptomatic interhemispheric arachnoid cysts in the elderly are predominantly located on the right side, have a long history of progressive symptomology, occur predominantly in females, and have no communication with the subarachnoid space. Interhemispheric arachnoid cysts are usually not associated with agenesis of the corpus callosum in elderly patients, whereas interhemispheric nonarachnoid cysts are usually associated with agenesis of the corpus callosum, which will be clearly demonstrated on magnetic resonance imaging.
  
  
  CONCLUSIONS
  It is highly possible that an interhemispheric cyst without agenesis of the corpus callosum in an adult is an arachnoid cyst.
authors.affiliation: Department of Neurosurgery, National Hospital, Kure Medical Center, Kure, Japan.
authors.forename: Fumiyuki
authors.initials: F
authors.lastname: Yamasaki
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Kodama
authors.forename: Takuhiro
authors.initials: T
authors.lastname: Hotta
authors.forename: Eiji
authors.initials: E
authors.lastname: Taniguchi
authors.forename: Kuniki
authors.initials: K
authors.lastname: Eguchi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yoshioka
authors.forename: Kazunori
authors.initials: K
authors.lastname: Arita
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kurisu
mesh_terms: D016080:Arachnoid Cysts / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D014695:Cerebral Ventriculography; D003399:Craniotomy; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D014057:Tomography, X-Ray Computed