Localized histiocytic sarcoma in a captive capybara (Hydrochoerus hydrochaeris)

Authors

  • Saralee Srivorakul
  • Kittikorn Boonsri
  • Thewarach Vechmanus
  • Pinich Boonthong
  • M. Gerard O’Sullivan
  • Kidsadagon Pringproa

Keywords:

Capybara, histiocytic sarcoma, Hydrochoerus hydrochaeris

Abstract

An irregular, subcutaneous mass (2x3x2 cm) located between the first and second digits of the left hindlimb of a nine-year-old, male, captive capybara (Hydrochoerus hydrochaeris) was biopsied. Microscopically, the mass scattered throughout the dermis. The neoplastic cells were arranged in solid-sheet patterns and comprised of pleomorphic histiocytic cells with pleomorphic nuclei and abundant eosinophillic cytoplasm. Mitotic figures were 2-3 cells/HPF. Numerous, multinucleated, giant cells, up to 10 nuclei/cells, were also prominently observed and found scattered throughout the mass. Immunohistochemically, the neoplastic cells were strongly positive for vimentin and ionized calcium-binding adaptor molecule 1 (Iba-1), while immunoreactivity for cytokeratin was negative. Based on histopathological and immunohistochemical characterizations, localized histiocytic sarcoma was diagnosed.

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How to Cite

Srivorakul, S., Boonsri, K., Vechmanus, T., Boonthong, P., O’Sullivan, M. G., & Pringproa, K. (2017). Localized histiocytic sarcoma in a captive capybara (Hydrochoerus hydrochaeris). The Thai Journal of Veterinary Medicine, 47(1), 131–135. Retrieved from https://he01.tci-thaijo.org/index.php/tjvm/article/view/82197

Issue

Section

Short Communications