Perinephric pseudocysts in the cat: A retrospective study and review of the literature

Perinephric pseudocysts (PNPs) are fluid-filled fibrous sacs that surround the kidney and are not lined by an epithelium. in cats, PNPs are idiopathic , but they usually occur in association with chronic renal failure (CRF). T hirteen cats with PNPs were examined. PNPs occurred in mixed breed cats of either sex with a median age of 16 years. The PNP was palpable on physical examination and usually was interpreted as renomegaly. Clinicopathologic fi ndings reflected CRE and urinary tract infection, was common. Rarely, a pri mary renal disease was diagnosed concurrent with PNPs and CRE Diagnosis of PNPs was made by ultrasound examination and fine-needle aspiration, and tre atment was by surgical removal of the PNP or ultrasound-guided drainage. Co mpared to previous reports of PNPs, this series of cats tended to be older and no sex predilection was found, but other findings were similar to those in the literature. Cats with PNPs may have a favorable prognosis if CRF is not severe and no other concurrent diseases are present.