title: Posttraumatic intradiploic arachnoid cyst of the posterior fossa.
abstract: We report the case of a 5-year-old girl with an enlarging suboccipital mass, a posttraumatic intraosseous arachnoid cyst. Diagnostic work-up revealed that the lesion consisted of an intradiploic arachnoid cyst and an extra-axial occipital pouch that communicated by way of an osseous and dural defect. Surgical repair was undertaken with good results. A search of the current literature has shown only seven previous reports of leptomeningeal cysts situated at the occipital bones, most of them the result of an antecedent skull fracture. A pathogenetic hypothesis is presented comparing the growth of arachnoid intraosseous cysts and the development of meningocencephaloceles.
authors.affiliation: Regional Neurosurgical Service, Virgen de la Arrixaca University Hospital, National Health Service, Murcia, Spain.
authors.forename: J F
authors.initials: JF
authors.lastname: Martínez-Lage
authors.forename: M
authors.initials: M
authors.lastname: Martínez Pérez
authors.forename: R
authors.initials: R
authors.lastname: Domingo
authors.forename: M
authors.initials: M
authors.lastname: Poza
mesh_terms: D016080:Arachnoid Cysts / Q000175:diagnosis / Q000601:surgery*; D002675:Child, Preschool; D003399:Craniotomy / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D009777:Occipital Bone / Q000293:injuries*; D011183:Postoperative Complications / Q000175:diagnosis; D012887:Skull Fractures / Q000175:diagnosis / Q000601:surgery*; D014057:Tomography, X-Ray Computed