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Eosinophilic keratoconjunctivitis in a horse

D T Ramsey1, H E Whiteley, P A Gerding

  • 1Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana 61801.

Journal of the American Veterinary Medical Association
|November 1, 1994
PubMed
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Eosinophilic keratitis in a horse resolved with corticosteroid ointment. This equine eye condition, characterized by corneal plaques, showed similar inflammatory cells to feline cases.

Area of Science:

  • Veterinary Ophthalmology
  • Equine Dermatology

Background:

  • Persistent subepithelial corneal plaques in horses can be challenging to diagnose and treat.
  • Understanding the cellular infiltrate and causative agents is crucial for effective management.

Observation:

  • An 11-year-old Quarter Horse presented with raised, 1-2 mm subepithelial corneal plaques on the left eye.
  • Cytology revealed numerous eosinophils and neutrophils, with fewer mast cells, plasma cells, and lymphocytes.
  • Histopathology confirmed subepithelial collagen degeneration infiltrated by eosinophils and neutrophils, surrounded by eosinophilic granular material.

Findings:

  • Bacteriologic culture yielded sparse growth of alpha-hemolytic Streptococcus and Staphylococcus spp.
  • The distribution of inflammatory cells in the conjunctiva mirrored that in the cornea.

Related Experiment Videos

  • Topical corticosteroid ointment administration led to complete resolution of corneal plaques within 28 days.

    • Implications:

    • The cytologic and histologic findings in this equine case were comparable to those reported in feline eosinophilic keratitis.
    • Corticosteroid therapy appears effective for resolving eosinophilic keratitis in horses.
    • This case highlights the potential for cross-species similarities in ocular inflammatory conditions.