title: [Solitary fibrous tumor of the orbit: an unusual cause of unilateral proptosis. Case report with a review of the literature].
abstract: BACKGROUND
  The solitary fibrous tumor (SFT) is a spindle-cell tumor that very rarely involves the orbit. We report a new case that we compare to reports in the literature.
  
  
  METHODS
  A 72-year-old woman presented a conjunctival inflammation of the right eye developing over 5 months with progressive proptosis. Magnetic resonance imaging revealed an extraconal and homogeneous mass, which showed hypointensity on T1-weighted images and hyperintensity on T2-weighted images, without specificity. Histological examination of the lesion removed by anterior orbitotomy confirmed the diagnosis of the SFT of the orbit. The patient was doing well without recurrence after 9 months.
  
  
  CONCLUSIONS
  The diagnosis of SFT is histological. It is a mesenchymal tumor. Immunohistochemically, the tumor cells are strongly positive for CD34 and vimentin.
  
  
  CONCLUSIONS
  The SFT of the orbit is a very rare and generally benign tumor. It must be immunohistochemically differentiated from other spindle-cell tumors of the orbit. The treatment is a complete surgical excision, and long-term follow-up is necessary because recurrence may appear long after treatment.
authors.affiliation: Service d'Ophtalmologie, Hôpital Gabriel Monpied, CHU Clermont-Ferrand, 58, rue Montalembert, BP69, 63003 Clermont-Ferrand cedex 1, France.
authors.forename: J-B
authors.initials: JB
authors.lastname: Dériot
authors.forename: A
authors.initials: A
authors.lastname: Ledoux-Pilon
authors.forename: F
authors.initials: F
authors.lastname: Pilon
authors.forename: A
authors.initials: A
authors.lastname: Ravel
authors.forename: P
authors.initials: P
authors.lastname: Déchelotte
authors.forename: D
authors.initials: D
authors.lastname: Rigal
authors.forename: F
authors.initials: F
authors.lastname: Chiambaretta
mesh_terms: D000368:Aged; D005094:Exophthalmos / Q000209:etiology*; D005260:Female; D006801:Humans; D009918:Orbital Neoplasms / Q000150:complications* / Q000473:pathology