Features of cystic calculi in cats in a hospital population.

The case records of 131 cats undergoing surgery for cystic calculi at The Animal Medical Center during the period of June 1969 to January 1975 were reviewed. Data for 16 intact females, 63 spayed females, 14 intact males, and 38 castrated males were analyzed. The mean age of first occurrence was 4.9 years. Meaningful conclusions regarding breed predisposition could not be made. Phosphate calculi were the predominant (124/128 analyzed) type. Swab specimens were taken from the bladder wall at time of surgery in 86 cases; only 28 (32.8%) were positive for bacteria.