title: Primary intraosseous meningiomas.
abstract: OBJECTIVE
  A retrospective study was performed to evaluate the clinical, radiological and histological findings of 14 intraosseous meningiomas.
  
  
  METHODS
  14 histologically proved intraosseous meningiomas were studied with plain skull film and CT. Pathological records were reviewed.
  
  
  RESULTS
  We found 9 calvarial cases and 5 spheno-orbital ones. The most common symptom in the calvarial cases was a lump in the scalp, and in the spheno-orbital lesions it was exophtalmos. Hyperostosis was present in all 5 spheno-orbital cases and in 3 out of the 9 calvarial ones; in the other 6 cases it had a mixed pattern. Enhanced dura was present in 3 calvarial cases and in 2 sphenoidal ones. Dura was involved in 5 cases: 2 with inflammatory changes, 2 with a minimal intradural tumour and one with a subdural tumour.
  
  
  CONCLUSIONS
  CT better detected both the bony reaction and the intraosseous extension of the tumour. The dural changes were not specific of tumoural involvement. The differential diagnosis comprises: fibrous dysplasia, osteoma, blastic metastasis and mainly meningioma en plaque (MEP). Comparing our findings with other series, we noticed that in some cases the term MEP was used for similar cases. As the name MEP is merely descriptive and both entities share a larger number of similarities than differences, we believe that a differentiation between hyperostotic en plaque meningioma and intraosseous meningioma can hardly be made.
authors.affiliation: Department of Radiology, Hospital Universitario La Fe, Valencia, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Arana
authors.forename: C
authors.initials: C
authors.lastname: Diaz
authors.forename: F F
authors.initials: FF
authors.lastname: Latorre
authors.forename: F
authors.initials: F
authors.lastname: Menor
authors.forename: A
authors.initials: A
authors.lastname: Revert
authors.forename: A
authors.initials: A
authors.lastname: Beltrán
authors.forename: M
authors.initials: M
authors.lastname: Navarro
mesh_terms: D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D004388:Dura Mater / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008579:Meningioma / Q000000981:diagnostic imaging*; D008875:Middle Aged; D012189:Retrospective Studies; D012886:Skull / Q000000981:diagnostic imaging; D012888:Skull Neoplasms / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed