Sinonasal meningioma in a Siberian tiger
Meningiomas are the most common primary brain tumor in dogs and cats. However, while there are numerous reports of extracranial —spinal, orbital and sinonasal — meningiomas in dogs, there have only been a few case reports of spinal meningiomas, and no post-mortem confirmed orbital or sinonasal meningiomas in cats.
In this study, researchers led by a team at the University of Pretoria in South Africa examined a 20-year-old captive tiger with a history of chronic ocular inflammation resulting in enucleation. This condition led to spontaneously developed tetanic convulsions, or epileptic seizures, that over a two-year period resulted in a gradually worsening condition and the animal was eventually euthanized.
At autopsy, a focal, expansile, neoplastic mass was found in the caudal nasal cavity midline, abutting the cribriform plate and slightly compressing the calvarium. Histological analysis revealed nasal turbinates attached to a well-circumscribed expansile multi-lobular mass consisting of interlacing whorls and streams of neoplastic cells supported by a variably fibrous to microcystic collagenous matrix displaying rare psammoma bodies.
The diagnosis was sinonasal transitional meningioma.
The research team concluded that this is the first report of a captive wild felid with an extracranial meningioma, and, more specifically, a tiger with a sinonasal transitional meningioma.
Louise van der Weyden, et al. “Sinonasal Meningioma in a Siberian Tiger (Panthera tigris altaica).” Veterinary Sciences. 2022 Aug 25;9(9):457. doi: 10.3390/vetsci9090457
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