title: Spontaneous Rupture of the Middle Fossa Arachnoid Cyst into the Subdural Space: Case Report.
abstract: BACKGROUND
  Arachnoid cysts are congenital, benign and intra-arachnoidal lesions. A great majority of arachnoid cysts are congenital. However, to a lesser extent, they are known to develop after head trauma and brain inflammatory diseases. Arachnoid cysts are mostly asymptomatic and they can develop anywhere in the brain along the arachnoid membrane.
  
  
  METHODS
  Arachnoid cysts form 1% of the non-traumatic lesions which occupy a place and it is thought to be a congenital lesion developed as a result of meningeal development abnormalities or a lesion acquired after trauma and infection. There is a male dominance at a rate of 3/1 in arachnoid cysts which locate mostly in the middle fossa. Our patient was a 2-years-old boy.
  
  
  CONCLUSIONS
  As a conclusion, spontaneous subdural hygroma is a rare complication of the arachnoid cysts. Surgical intervention could be required in acute cases.
authors.affiliation: Department of Radiology, Medicine Faculty, Van, Turkey.
authors.forename: Aydın
authors.initials: A
authors.lastname: Bora
authors.affiliation: Department of Radiology, Medicine Faculty, Van, Turkey.
authors.forename: Adem
authors.initials: A
authors.lastname: Yokuş
authors.affiliation: Department of Radiology, Medicine Faculty, Van, Turkey.
authors.forename: Abdussamet
authors.initials: A
authors.lastname: Batur
authors.affiliation: Department of Radiology, Medicine Faculty, Van, Turkey.
authors.forename: Mehmet Deniz
authors.initials: MD
authors.lastname: Bulut
authors.affiliation: Department of Radiology, Medicine Faculty, Van, Turkey.
authors.forename: Alpaslan
authors.initials: A
authors.lastname: Yavuz
authors.affiliation: Department of Neorosurgery, Medicine Faculty, Van, Turkey.
authors.forename: İsmail
authors.initials: İ
authors.lastname: Gülşen
authors.affiliation: Department of Radiology, Medicine Faculty, Van, Turkey.
authors.forename: Mesut
authors.initials: M
authors.lastname: Özgökçe
authors.affiliation: Department of Neorosurgery, Medicine Faculty, Van, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Arslan
keywords: Arachnoid Cysts; Magnetic Resonance Imaging; Subdural Effusion; Tomography Scanners, X-Ray Computed