A 4-year and 2-month-old male
capybara (Hydrochoerus hydrochaeris) was diagnosed with squamous cell
carcinoma on the buttocks after chronic recurrent dermatosis. The capybara was euthanized,
examined by computed tomography and necropsied; the tumor was examined histologically.
Computed tomography showed a dense soft tissue mass with indistinct borders at the
buttocks. Histological examination of the tumor revealed islands of invasive squamous
epithelial tumor cells with a severe desmoplastic reaction. Based on the pathological
findings, the mass was diagnosed as a squamous cell carcinoma. This is the first study to
report squamous cell carcinoma in a capybara.
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