Squamous Papilloma of the Conjunctiva in a Dog

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  • SATO Kazuaki
    Department of Small Animal Internal Medicine I, School of Veterinary Medicine, University of Kitasato
  • KANAI Kazutaka
    Department of Small Animal Internal Medicine I, School of Veterinary Medicine, University of Kitasato
  • HATAI Hitoshi
    Department of Veterinary Pathology, School of Veterinary Medicine, University of Kitasato
  • KOBAYASHI Yoshiyasu
    Laboratory of Veterinary Pathology, Division of Pathological Science, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • YAMASHITA Yohei
    Department of Small Animal Internal Medicine I, School of Veterinary Medicine, University of Kitasato
  • KIMURA Yuya
    Department of Small Animal Internal Medicine I, School of Veterinary Medicine, University of Kitasato
  • ITOH Naoyuki
    Department of Small Animal Internal Medicine I, School of Veterinary Medicine, University of Kitasato

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  • 結膜に生じた扁平上皮乳頭腫の犬の1例

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<p>Papillomas can be of papillomaviral or nonviral origin. Papillomas of the conjunctiva in dogs have been described infrequently, and most published reports have elucidated the association with papillomavirus infection. Only one previous study has described conjunctival squamous papillomas that did not express papillomavirus proteins. Here, we report an intact female Chihuahua, aged 9 years and 11 months, that presented with a localized papillomatous lesion on the bulbar conjunctiva of the left eye. The entire conjunctival lesion was surgically removed and submitted for histopathological examination. The findings of the examination confirmed the diagnosis of a squamous papilloma; however, cellular vacuolization, which is often present in viral infection, was observed in some parts of the epithelium. We performed immunohistochemical tests using an anti-bovine papilloma virus antibody and did not observe papillomavirus antigens in the lesion. This study demonstrated that histopathological examination can distinguish between the viral and nonviral conjunctival papillomas, and that virological analysis is a useful diagnostic aid for suspected cases of viral infection, such as the present case.</p>

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