Charles Louis Davis and Samuel Wesley Thompson DVM Foundation

For the Advancement of Veterinary and Comparative Pathology

info@cldavis.org | Phone: 847-367-4359 | Fax: 847-247-1869

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Image: F30320

Pathology Image
  • SPECIES:
    • EQUINE
  • SYSTEM:
    • RESPIRATORY
  • ORGAN:
    • LUNG
  • DIAGNOSIS:
    • GRANULAR CELL TUMOR
  • CONTRIBUTOR:
    • WILLIAMS
  • INSTITUTION:
    • Armed Forces Institute of Pathology
  • GENPATH:
    • NEOPLASIA
  • COMMENTS:
    • Granular cell tumors in the horse are usually seen in horses in association with airways, often bulging into them and causing various amounts of obstruction. The granules are PAS-positive, diastase resistant lysosomes, and due to the presence of myelin within them, may stain variably acid fast. The cells stain positive for S-100 and vimentin. The cell of origin is considered to be a Schwann cell.