title: Solitary fibrous tumor of the orbit.
abstract: OBJECTIVE
  We studied a case of solitary fibrous tumor of the orbit in a 75-year-old man.
  
  
  METHODS
  The patient had painless, slowly progressive proptosis of eight months' duration. He underwent magnetic resonance imaging, which showed a well-circumscribed retrobulbar mass. The tumor was excised.
  
  
  RESULTS
  Examination of the tumor disclosed haphazardly arranged spindle cells alternating with collagenous, hypocellular areas in a richly vascular background without necrosis. Immunoperoxidase stains showed characteristic expression of CD34 and vimentin.
  
  
  CONCLUSIONS
  Solitary fibrous tumor can infrequently involve the orbit and may recur locally and metastasize, necessitating long-term follow-up.
authors.affiliation: Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago Eye Center, Illinois, 60612, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: DeBacker
authors.forename: F
authors.initials: F
authors.lastname: Bodker
authors.forename: A M
authors.initials: AM
authors.lastname: Putterman
authors.forename: E
authors.initials: E
authors.lastname: Beckmann
mesh_terms: D000368:Aged; D018952:Antigens, CD34 / Q000032:analysis; D005094:Exophthalmos / Q000473:pathology; D005350:Fibroma / Q000737:chemistry / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D008297:Male; D009918:Orbital Neoplasms / Q000737:chemistry / Q000473:pathology*; D010146:Pain; D014746:Vimentin / Q000032:analysis
chemical_list: D018952:Antigens, CD34; D014746:Vimentin