title: [Primary extradural meningioma of the orbits: a report of a patient and review of the literature].
abstract: BACKGROUND
  Over 98% of all meningiomas originate in the central nervous system including the optic fascicle. Spread outside this area occurs in 20% of cases. Ectopic (extradural) meningiomas that do not originate from either the optic fascicle or the intracranial meninges are exceedingly rare. We treated a patient with an ectopic meningioma of the orbit and reviewed the literature concerning ectopic orbital meningiomas.
  
  
  METHODS
  A 30-year-old man presented with a painless tumor in the left medial canthal area. This tumor had developed over a period of two years. The patient complained of intermittent epiphora. Ophthalmologic examination revealed a slight lateral displacement of the left eye. There was a palpable medial orbital mass with an otherwise normal ophthalmological examination. Computed tomography and magnetic resonance imaging showed a homogeneous, well-marginated soft tissue mass.
  
  
  RESULTS
  The lesion which had neither a contact to the dura of the anterior cranial fossa nor to the optic fascicle was excised and histologic examination showed a fibroblastic meningioma. There was no recurrent tumor after a follow-up of 18 months.
  
  
  CONCLUSIONS
  Less than 50 ectopic (extradural) meningiomas of the orbit have been described in the literature. The most common histologic type is the meningotheliomatous (syncytial or transitional) meningioma. The mean age at diagnosis of these tumors is 31 years. After complete resection the prognosis is good.
authors.affiliation: Universitäts-Augenklinik Ulm.
authors.forename: C W
authors.initials: CW
authors.lastname: Spraul
authors.forename: O
authors.initials: O
authors.lastname: Gareis
authors.forename: G K
authors.initials: GK
authors.lastname: Lang
mesh_terms: D000328:Adult; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D009915:Orbit / Q000473:pathology / Q000601:surgery; D009918:Orbital Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed
vernacular_title: Primär extradurales Meningeom der Orbita: Ein Bericht uber einen Patienten sowie Literaturübersicht.