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An 8-year-old Anglo-European gelding with progressive neurological signs was humanely destroyed and submitted for necropsy examination. The right parietal cortex was disrupted by a well-demarcated, intraparenchymal, 1.5 cm diameter, tan, homogeneous, dense mass. Microscopical examination was consistent with an astrocytoma, which was confirmed on the basis of strong immunohistochemical labelling for glial fibrillary acidic protein. The neoplastic population lacked immunolabelling for oligodendrocyte transcription factor 2. Labelling for ionized calcium binding adaptor molecule 1 highlighted large numbers of reactive microglia throughout the proliferation and in the adjacent neuroparenchyma. While rare, primary brain tumours should be considered as a differential in horses presenting with progressive neurological signs. Copyright © 2020 Elsevier Ltd. All rights reserved.


J P Cavasin, A D Miller, G E Duhamel. Intracerebral Astrocytoma in a Horse. Journal of comparative pathology. 2020 May;177:1-4

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PMID: 32505235

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