Cannon, A. B., J. L. Westropp, et al. (2007). “Evaluation of trends in urolith composition in cats: 5,230 cases (1985-2004).” J Am Vet Med Assoc 231(4): 570-6.
This retrospective case series looked at 5,230 urinary tract stones submitted to the Gerald V. Ling Urinary Stone Analysis Laboratory (University of California, Davis) from 1985 to 2004. Over the past 20 years, the ratio of calcium oxalate stones to struvite stones has increased significantly. However, this trend may be changing. In the last 3 years of the study period, more struvite stones were submitted than calcium oxalate stones. The most common location for both struvite and calcium oxalate stones was the bladder, but the number of calcium oxalate stones from the upper urinary tract increased significantly over time during the study period.
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Picavet, P., J. Detilleux, et al. (2007). “Analysis of 4495 canine and feline uroliths in the Benelux. A retrospective study: 1994-2004.” J Anim Physiol Anim Nutr (Berl) 91(5-6): 247-51.