title: Giant Leaking Colloid Cyst Presenting with Aseptic Meningitis: Review of the Literature and Report of a Case.
abstract: BACKGROUND
  Colloid cysts are benign third ventricle lesions that need to be diagnosed correctly because of their association with sudden death. Chemical or aseptic meningitis is a rare presentation of a colloid cyst.
  
  
  METHODS
  We present a case of a 69-year-old man with fever, alteration of mental status, and meningismus. Microbiological examination of the cerebrospinal fluid revealed aseptic meningitis. Brain imaging revealed a third ventricular colloid cyst with hydrocephalus.
  
  
  RESULTS
  The tumor was resected via endoscopic intervention. There were no persistent operative complications related to the endoscopic procedure.
  
  
  CONCLUSIONS
  Chemical or aseptic meningitis is an unusual clinical manifestation of a colloid cyst, complicating the differential diagnosis, especially in the elderly.
authors.affiliation: Department of Neurosurgery, Loghman e Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: mehrdaada@yahoo.com.
authors.forename: Mehrdad Hosseinzadeh
authors.initials: MH
authors.lastname: Bakhtevari
authors.affiliation: Department of Neurosurgery, Loghman e Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Guive
authors.initials: G
authors.lastname: Sharifi
authors.affiliation: Department of Neurosurgery, Loghman e Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Jabbari
authors.affiliation: Department of Neurosurgery, Emam Khomeini Hospital, Mazandaran University of Medical Sciences, Sari, Iran.
authors.forename: Misagh
authors.initials: M
authors.lastname: Shafizad
authors.affiliation: Department of Neurosurgery, Loghman e Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Mona
authors.initials: M
authors.lastname: Rezaei
authors.affiliation: Department of Neurosurgery, Loghman e Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Samadian
authors.affiliation: Department of Neurosurgery, Loghman e Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Omidvar
authors.initials: O
authors.lastname: Rezaei
mesh_terms: D000368:Aged; D056364:Colloid Cysts / Q000134:cerebrospinal fluid / Q000150:complications* / Q000601:surgery*; D004724:Endoscopy; D006801:Humans; D008297:Male; D008582:Meningitis, Aseptic / Q000134:cerebrospinal fluid / Q000150:complications* / Q000601:surgery*; D019635:Neurosurgical Procedures; D020542:Third Ventricle / Q000473:pathology; D016896:Treatment Outcome
keywords: Aseptic meningitis; Colloid cysts; Hydrocephalus; Neuroendoscopy