Authors
Mario Romero-Vega, Katharina Gregor, Isabel Hagnauer, Alejandro Alfaro-Alarcón, Andreas Beineke
Published in
Frontiers in veterinary science. Volume 13. Pages 1857938. Epub Aug 14, 2026.
Abstract
Neoplasia in free ranging wildlife remains poorly documented, particularly in non-human primates. An adult free ranging female mantled howler monkey (Alouatta palliata) was found conscious but non-ambulatory on a country road in northwestern Costa Rica. Following admission to a wildlife rescue center, euthanasia was elected due to poor prognosis and body condition. At necropsy, three firm, gritty, white masses were identified on the inner surface of the parietal bones. Histopathologic examination revealed a well-circumscribed, moderately cellular, encapsulated neoplastic proliferation arising from the dura mater and compressing the cerebral cortex while sparing the leptomeninges. Neoplastic cells were arranged in whorls and occasional interlacing streams, with sporadic psammoma bodies. A diagnosis of transitional meningioma was made. Immunohistochemically, neoplastic cells were positive for S100 and negative for pan-cytokeratin, vimentin, and E-cadherin. Reports of meningiomas in non-human primates, particularly in free ranging individuals, are scarce. This case contributes to the limited knowledge of neoplasia in wildlife and underscores the value of documenting neoplasia in free ranging primates.
PMID:
42666247
Bibliographic data and abstract were imported from PubMed on 29 Aug 2026.
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