title: Solitary fibrous tumor of the lacrimal sac.
abstract: OBJECTIVE
  Solitary fibrous tumor is a rare spindle cell tumor arising in the pleura. We report two cases of this tumor occurring in the lacrimal sac.
  
  
  METHODS
  A 23-year-old man and a 34-year-old woman presented with a medial canthal mass. They underwent surgical excision of their tumors.
  
  
  RESULTS
  Solitary fibrous tumors were diagnosed by light microscopy, immunohistochemical study, and electron microscopy. Immunohistochemical staining showed that tumor cells were reactive with vimentin and CD34 and demonstrated no smooth muscle or neural differentiation (nonreactive with desmin and S-100 protein).
  
  
  CONCLUSIONS
  The findings indicate that solitary fibrous tumor can occur in the lacrimal sac and may recur locally if it is removed incompletely. To our knowledge, these are the first reported cases of solitary fibrous tumors occurring in the lacrimal sac.
authors.affiliation: Department of Ophthalmology, Sungkyunkwan University College of Medicine, Kangbuk Samsung Hospital, Seoul, Korea.
authors.forename: K I
authors.initials: KI
authors.lastname: Woo
authors.forename: Y L
authors.initials: YL
authors.lastname: Suh
authors.forename: Y D
authors.initials: YD
authors.lastname: Kim
mesh_terms: D000328:Adult; D001706:Biopsy; D003937:Diagnosis, Differential; D005134:Eye Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D007766:Lacrimal Apparatus Diseases / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008297:Male; D018218:Neoplasms, Fibrous Tissue / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed