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Updated: Jan 7, 2026

Identification of Neutrophil Extracellular Traps in Paraffin-Embedded Feline Arterial Thrombi using Immunofluorescence Microscopy
Published on: March 29, 2020
Perirenal cyst-like lesions associated with feline infectious peritonitis in a Maine Coon cat
Lovisa Hällström1, Emilian Malek2, Anna Tidholm1
1AniCura Albano Animal Hospital, Danderyd, Sweden.
Case Summary:
A 7-month-old intact male Maine Coon cat was presented because of intermittent pyrexia, hyporexia and lethargy. On abdominal palpation, both kidneys appeared to be enlarged with an irregular shape. Haematology and serum biochemistry showed anaemia, hypoalbuminaemia and hyperproteinaemia. Ultrasonographic findings included multiple perirenal cyst-like lesions, heterogenous cortices with cortical striation and a medullary band sign, as well as renomegaly. The cat was euthanased and a limited necropsy of the kidneys revealed pyogranulomatous lesions, which were confirmed to be related to feline infectious peritonitis (FIP) by immunohistochemistry.
Relevance And Novel Information:
To the authors' knowledge, this is the first published report describing perirenal cyst-like lesions of the kidneys related to FIP.
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