Perirenal subcapsular hematomas in feline infectious peritonitis

In this article, the occurrence of perirenal subcapsular hematomas associated with feline infectious peritonitis (FIP) is described. The three cats included in the study showed signs of cachexia, anemia and icterus. Post mortem, typical lesions of FIP were found, as well as a subcapsular perirenal hematoma associated with renal pyogranuloma. Most likely, severe pyogranulomatous inflammation caused vascular rhexis eventually leading to this hematoma formation. Nanopore sequencing resulted in a genetic tree that showed that the sequences of the cats belonged to the same serotype, but were not related to each other. In this case series, it is demonstrated that perirenal hematomas can develop as a complication of FIP.