A fibrosarcoma in the skeletal muscle of a capybara (Hydrochoerus hydrochaeris).

  title={A fibrosarcoma in the skeletal muscle of a capybara (Hydrochoerus hydrochaeris).},
  author={Dana A Stoffregen and A W Prowten and Howard N. Steinberg and W I Anderson},
  journal={Journal of wildlife diseases},
  volume={29 2},
An 8-yr-old male capybara (Hydrochoerus hydrochaeris), a resident of an urban zoological collection in upstate New York (USA), had a mass posteroventral to its left stifle; it was of unknown duration. The mass was a fibrosarcoma based on invasive sheets of interwoven spindle-shaped neoplastic cells with moderate associated extracellular matrix composed of collagen fibers. Supportive immunohistochemical staining was positive for vimentin but negative for cytokeratins, desmin, and myoglobin. The… CONTINUE READING

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