Cysts are defined as abnormal, fluid-filled sacs that develop within the structure of the kidney tissue. In the general geriatric cat population, solitary "simple cysts" are a relatively common incidental finding and often do not significantly impact overall function. However, the presence of multiple, widespread cysts is the hallmark of Polycystic Kidney Disease (PKD). This is a specific inherited genetic disorder predominantly found in Persian, Himalayan, and Exotic Shorthair breeds. In cats with PKD, small cysts are present from birth and gradually enlarge over the animal's lifetime. As these fluid pockets expand, they physically crowd out and compress the surrounding healthy tissue. This mechanical pressure destroys the functional nephrons, leading inevitably to Chronic Kidney Disease. Unlike typical CKD kidneys which tend to shrink and scar, kidneys affected by PKD often become dramatically enlarged and lumpy to the touch. Management is supportive, as there is no way to surgically remove the cysts without damaging the kidney. Treatment focuses on managing the renal failure and monitoring for complications such as cyst infection or rupture.
Disclaimer: This content is for educational purposes only and does not constitute veterinary medical advice. Always consult with your primary care veterinarian or a veterinary internal medicine specialist regarding your cat’s specific condition.