title: Endoscopic ventriculo-cystomy for non-communicating hydrocephalus secondary to quadrigeminal cistern arachnoid cyst.
abstract: BACKGROUND
  Intracranial arachnoid cysts are developmental, anomalous collections of cerebrospinal fluid (CSF), and occasionally cause symptoms when large enough to obliterate the CSF outflow pathway and give rise to non-communicating hydrocephalus. The treatment of choice for symptomatic arachnoid cysts has been surgical excision or fenestration of the cyst, but less invasive endoscopic fenestration has been attempted with favorable preliminary results.
  
  
  METHODS
  We report a case of non-communicating hydrocephalus caused by a quadrigeminal cistern arachnoid cyst in a 35-year-old woman who presented with worsening headaches. She was successfully treated by endoscopic third ventriculostomy and fenestration of the cyst (ventriculo-cistomy).
  
  
  CONCLUSIONS
  Endoscopic fenestration of symptomatic arachnoid cysts can be as effective as open surgery in terms of short-term efficacy, and it is certainly less invasive than open surgery. However, its long-term outcome remains unknown, and these rare cases require careful clinical and radiological follow-up.
authors.affiliation: Department of Neurosurgery, National Tokyo Medical Center, Tokyo, Japan. ginamasu@aol.com
authors.forename: J
authors.initials: J
authors.lastname: Inamasu
authors.forename: T
authors.initials: T
authors.lastname: Ohira
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
authors.forename: R
authors.initials: R
authors.lastname: Saito
authors.forename: Y
authors.initials: Y
authors.lastname: Kuroshima
authors.forename: K
authors.initials: K
authors.lastname: Mayanagi
authors.forename: S
authors.initials: S
authors.lastname: Ohba
authors.forename: K
authors.initials: K
authors.lastname: Ichikizaki
mesh_terms: D000328:Adult; D016080:Arachnoid Cysts / Q000601:surgery*; D002552:Cerebral Ventricles / Q000473:pathology; D004724:Endoscopy; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D009460:Neurologic Examination; D011183:Postoperative Complications / Q000175:diagnosis; D014057:Tomography, X-Ray Computed; D014696:Ventriculostomy