title: Orbital solitary fibrous tumor: report of two cases and literature review.
abstract: BACKGROUND
  Solitary fibrous tumor (SFT) is a rare, benign, and very uncommon lesion in the orbit. Because of its complex and variable clinical and histological appearance the SFT is often misdiagnosed.
  
  
  METHODS
  Two new cases of orbital SFT are reported, one in a man and the other in a woman, both unilateral and in the superomedial orbit.
  
  
  METHODS
  Clinical and tomographical evaluations were conducted and the lesions were excised. The histological evaluation showed the tumors were composed of spindle-shaped cells within collagen bundles and vascular channels. Immunohistochemical staining was positive for CD 34 and negative for S-100 protein.
  
  
  CONCLUSIONS
  Immunohistochemical study is an important adjuvant in determining the SFT diagnosis. Long-term follow-up is necessary because of the possibility of SFT recurrence after excision.
authors.affiliation: Departments of Ophthalmology, Botucatu School of Medicine, UNESP, São Paulo State, Botucatu, Brazil.
authors.forename: Silvana A
authors.initials: SA
authors.lastname: Schellini
authors.forename: Erika
authors.initials: E
authors.lastname: Hoyama
authors.forename: Mariângela E A
authors.initials: ME
authors.lastname: Marques
authors.forename: Eliane S
authors.initials: ES
authors.lastname: Abreu
authors.forename: Seizo
authors.initials: S
authors.lastname: Yamashita
mesh_terms: D018952:Antigens, CD34 / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D005260:Female; D005350:Fibroma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D009418:S100 Proteins / Q000032:analysis; D014057:Tomography, X-Ray Computed
chemical_list: D018952:Antigens, CD34; D014408:Biomarkers, Tumor; D009418:S100 Proteins