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Eosinophilic conjunctivitis, herpes virus and mast cell tumor of the third eyelid in a cat
Authors:Larocca RD
Institution:Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, 1352 Boyd Avenue, St Paul, MN 55108, USA
Abstract:A 3-year-old Himalayan cat was diagnosed with concurrent eosinophilic conjunctivitis, herpes virus, and a conjunctival mast cell tumor. Eosinophilic conjunctivitis was verified via cytology from a conjunctival scraping, which revealed 50% eosinophils and 50% neutrophils. Herpes virus was verified via a positive polymerase chain reaction (PCR). Conjunctival scrapings for chlamydia immmunofluorescent antibody (IFA) and herpes IFA were negative. A mycoplasma was detected by a general mycoplasma PCR but the organism did not grow on the available mycoplasma media. The mass was excised and microscopic evaluation revealed a histiocytic mast cell tumor. The mast cell did not recur following local excision (at 1 year follow-up). The eosinophilic conjunctivitis was treated with both topical steroids and systemic megesterol acetate (Ovaban). When topical steroids were used, the herpes virus flared up and resulted in dendritic and geographic corneal ulceration. Therefore, the cat was treated with megesterol acetate and the eosinophilic conjunctivitis was well controlled. Treatment of eosinophilic conjunctivitis in the cat with megesterol acetate may be the treatement of choice due to the possibility of herpes virus.
Keywords:conjunctival mast cell tumor  eosinophilic conjunctivitis  feline conjunctivitis  herpes virus  nictitans tumor  third eyelid tumor
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