Peer-reviewed veterinary case report
Feline infectious peritonitis diagnosed in 6-month-old cat by tissue
By Mehmet Burak Ateş et al.·Published in Eurasian Journal of Veterinary Sciences·2021
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Original publication title: Diagnosis of feline infectious peritonitis by immunohistochemistry and histopathology methods: a case report based on diagnostic approach
- Species:
- cat
Plain-English summary
A 6-month-old male domestic shorthair cat was diagnosed with feline infectious peritonitis (FIP) after showing signs of severe abdominal swelling and fluid buildup. During the necropsy, the vet found a significant amount of yellow fluid in the abdomen and signs of inflammation in the liver and intestines. The diagnosis was confirmed through special staining techniques that highlighted the presence of specific inflammatory cells. Unfortunately, this case indicated that the cat had progressed from the dry form of FIP to the wet form, which is often more severe.
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Abstract
<b>Aim:</b> In this study the case of feline infectious peritonitis (FIP) has been identified as histopathological and immunohistochemical (IHC) in a 6-month-old male domestic shorthair cat. In necropsy, the abdominal cavity contained a significant volume of yellow liquid and granular fibrinous exudate was seen on the liver, serosa of intestines, and peritoneum. Microscopically, inflammatory cell infiltration and fibrin exudation, consisting mainly of macrophage, lymphocyte and plasma cells, were determined around small and medium-sized vessels in the tunica serosa layer of the intestines. Many granulomatous foci of various sizes, with or without necrosis, were found in the liver, spread to the parenchyma. In methyl green pyronin staining, plasma cells were found to be the majority of the inflammatory cells present in lesions. In IHC staining with specific antibodies against the agent, immunopositivity was obtained in granulomatous lesions in the serosa layer of the intestines and less frequently in the cytoplasm of mononuclear cells in the lamina propria. Immunoreactivity was detected in the cytoplasm of macrophages in the liver, around both pyrogranulomas and granulomas. It was concluded that this case of FIP, when all findings are evaluated together, may have started as a dry form, and turned into a wet form in the terminal period.
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