Histiocytic Sarcoma in a Captive Hybrid Orangutan (Pongo sp.): Morphological and Immunohistochemical Features

ANIMALS(2024)

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Abstract
Histiocytic sarcoma (HS), an infrequent highly aggressive hematopoietic tumor, has been observed in diverse animal species, with isolated occurrences in non-human primates. This study describes the first case of disseminated HS in a 45-year-old female hybrid captive orangutan. The clinical profile mirrored symptoms seen in human HS cases, encompassing anorexia and ascites. Detailed histopathological examination demonstrated characteristic features of this tumor and immunohistochemistry, using markers such as Iba-1 and HLA-DR, confirmed the diagnosis. Significantly, the absence of CD163 and CD204 expression challenges their diagnostic utility in non-human primates. This investigation enhances our understanding of HS diagnosis in non-human primates, underscoring the necessity for standardized markers and diagnostic protocols.
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Key words
histiocytic sarcoma (HS),non-human primates (NHPs),immunohistochemistry,neoplasia,orangutan
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