title: Intravascular papillary endothelial hyperplasia of the conjunctiva in a horse.
abstract: OBJECTIVE
  Vascular tumors of the conjunctiva in the horse are rare. We present a unique case of an intravascular papillary endothelial hyperplasia of the conjunctiva.
  
  
  METHODS
  Horse.
  
  
  METHODS
  Case report. A 6-year-old-mare presented with a red mass in the conjunctiva of the left eye. After complete ophthalmologic examination the lesion was excised. The tissue was processed for light microscopy and studied histopathologically.
  
  
  RESULTS
  Pathologic examination revealed a nonencapsulated vascular lesion composed of confluent vascular spaces filled by multiple papillary structures composed of a central collagenous core lined by hyperplastic endothelial cells. There was neither atypical endothelial cell nor mitotic activity.
  
  
  CONCLUSIONS
  Intravascular papillary endothelial hyperplasia is a benign proliferative lesion that should be differentiated from malignant vascular tumors.
authors.affiliation: School of Veterinary Sciences, University of Buenos Aires, Chorroarín 280(1427), Buenos Aires, Argentina. hdh@fvet.uba.ar
authors.forename: Héctor Daniel
authors.initials: HD
authors.lastname: Herrera
authors.forename: Adriana Graciela
authors.initials: AG
authors.lastname: Duchene
authors.forename: J Oscar
authors.initials: JO
authors.lastname: Croxatto
authors.forename: Nora
authors.initials: N
authors.lastname: Burgués
authors.forename: Hugo
authors.initials: H
authors.lastname: Amusquibar
mesh_terms: D000818:Animals; D003230:Conjunctival Neoplasms / Q000175:diagnosis / Q000662:veterinary*; D003937:Diagnosis, Differential; D005260:Female; D006391:Hemangioma / Q000175:diagnosis / Q000662:veterinary*; D006734:Horse Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006736:Horses