Peer-reviewed veterinary case report
Cat with unusual brain cyst found by MRI and necropsy
By Schuwerk, Lukas et al.·Published in Journal of comparative pathology·2023·Department of Pathology, Germany·View original on PubMed →
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Original publication title: Atypically located arachnoid cyst in a five-year-old cat.
- Species:
- cat
Plain-English summary
A 5-year-old male neutered European Shorthair cat was brought in with signs of chronic neurological issues, including unusual behavior and coordination problems. After performing an MRI, the vet found a fluid-filled cyst in the brain that wasn't enhancing with contrast, indicating it was likely an arachnoid cyst. A necropsy confirmed this diagnosis, showing the cyst was filled with clear fluid and surrounded by meningeal tissue. While the cat's condition was serious, the findings help veterinarians understand similar cases better.
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Abstract
Arachnoid cysts are cystic lesions that occur in spinal or intracranial locations in the leptomeningeal space. Four intracranial cases have been described in cats, three of which were diagnosed by imaging techniques alone. We now report the clinical, gross and histopathological findings in a 5-year-old, male-neutered European Shorthair cat that presented with chronic, asymmetrical encephalopathy. Using magnetic resonance imaging, a focal, fluid-filled cavity that did not show contrast enhancement was identified in the left temporal and piriform lobes. Necropsy confirmed the presence of a cystic, meningeal cavity filled with clear, serous fluid. Histologically, the cyst had an irregular, hypereosinophilic surface and single psammoma bodies with moderate perivascular oedema in the adjacent neuroparenchyma. Immunohistochemical evidence of meningeal tissue surrounding the cyst confirmed the diagnosis of an arachnoid cyst, which should be considered as a differential diagnosis of intracranial, fluid-filled cavities.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/36641986/