title: Arachnoid cyst rupture with subdural hygroma: report of three cases and literature review.
abstract: BACKGROUND
  Arachnoid cysts are believed to account for about 1% of all intracranial expansive lesions, some remain inactive throughout life, others lie dormant for many years before clinical manifestation. In a few cases, arachnoid cysts have ruptured after cranial trauma or more rarely, spontaneously, with resultant subdural haemorrhage or CSF collection.
  
  
  METHODS
  We report three cases with traumatic rupture of arachnoid cyst into the subdural space in children, which is an extremely unusual complication.
  
  
  CONCLUSIONS
  A review of the literature revealed only 18 previously reported cases.
authors.affiliation: Service of Neurosurgery, Department of Surgery, Clinic Hospital of Santiago, University of Santiago de Compostela, La Choupana, 15706 Santiago de Compostela, Spain. cimigego@usc.es
authors.forename: Miguel
authors.initials: M
authors.lastname: Gelabert-González
authors.forename: Juan
authors.initials: J
authors.lastname: Fernández-Villa
authors.forename: Juan
authors.initials: J
authors.lastname: Cutrín-Prieto
authors.forename: Alfredo
authors.initials: A
authors.lastname: Garcìa Allut
authors.forename: Ramón
authors.initials: R
authors.lastname: Martínez-Rumbo
mesh_terms: D000293:Adolescent; D000328:Adult; D016080:Arachnoid Cysts / Q000150:complications* / Q000175:diagnosis; D002648:Child; D016489:Head Injuries, Closed / Q000150:complications*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D012421:Rupture; D013353:Subdural Effusion / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D014057:Tomography, X-Ray Computed