This retrospective case control study explains associations between feline urate urolithiasis and breed age gender and urine composition. Egyptian Maus and urate urolithiasis was amazing. The association in Siamese pet cats is consistent with prior reports and the association with Birman pet cats requires further study. Résumé Urolithiase d’urate fécollection. Cette étude rétrospective de cas témoins décrit les associations entre l’urolithiase d’urate fécollection et la race l’age le sexe et la composition de l’urine. Les donnésera de cas d’urolithes félins soumis au Centre canadien vétérinaire d’urolithiase (CCVU) entre le 2 février 1998 et le 7 juillet 2007 ont été examinésera. On a examiné 10 083 urolithes félins incluant 385 d’urate d’ammonium 13 d’acide urique et 21 d’urolithes mélangés d’urate/struvite. Les chats de races Mau égyptien Birman et Siamois présentaient une prédisposition significative à l’urolithiase d’urate [rapport de cotes (RC) = 118 95 % intervalle de confiance (IC) = 38 2 à 510 < 0 1 (RC = 9 1 95 % IC = 2 0 à 32 < 0 1 et (RC = 3 9 95 % IC = 2 5 à 5 9 < 0 1 respectivement. L’urolithiase d’urate était plus fréquente chez les jeunes chats (age moyen de 6 3 ans contre 7 1 ans chez les chats avec d’autres urolithes < 0 1 et chez les chats males (= 0 24 L’association ING4 antibody entre les Maus égyptiens et les urolithiases d’urate était remarquable. L’association chez les chats Siamois était conforme à celle présentée dans des rapports antérieurs et l’association chez les chats Birmans exige de nouvelles études. (Traduit par Isabelle Vallières) Intro Uroliths are aggregates of crystalline and matrix material that form in one or more locations within the urinary tract when urine becomes oversaturated with crystallogenic substances and may become composed of one or more mineral types (1). Compared to struvite and oxalate the prevalence of urate urolithiasis in pet cats is definitely low (2-4) and does not appear to possess changed significantly in the last 2 decades. One study of 20 343 feline uroliths reported that 5.6% were composed of Gleevec uric acid and urate (2). This is consistent with previous studies reporting rates of 3.1% (3) to 6.3% (5). In a more recent study of 5230 feline uroliths and urethral plugs stones which contained a component of urate were recognized in 507 submissions (10%) (6). While less common than calcium oxalate and struvite uroliths urate uroliths can nonetheless be important considering the quantity of pet cats that develop urolithiasis. In dogs reported breed predilections include dalmatians (7-10 13 English bulldogs miniature schnauzers shih tzus Yorkshire terriers (9-12) and Russian black terriers (14). Pure urate uroliths happen more often in male dogs than females (11 13 15 Siamese pet cats have significantly more urate comprising calculi and Persian Gleevec pet cats significantly fewer (3 6 but there has been minimal investigation of factors associated with urate urolithiasis in pet cats. The purpose of this study was to describe associations between feline urate urolithiasis and breed age gender and urine composition. Materials and methods The mineral composition of uroliths submitted to the Canadian Veterinary Urolith Centre (CVUC) was evaluated. Uroliths are submitted by Gleevec veterinary practitioners for quantitative evaluation mainly from across Canada; a small number of submissions come from the United States. Only submissions from a single episode of urolithiasis were included. Only uroliths from your first episode of urolithiasis were included if more than 1 urolith was submitted from an individual animal during the study period (recurrence of urolithiasis). All uroliths submitted for any Gleevec given episode were analyzed. To Gleevec determine the mineral composition each coating of each specimen was analyzed by optical crystallography using polarized light microscopy. If additional clarification was needed another quantitative technique was used such as X-ray micro-analysis Fourier transformation infrared spectroscopy or scanning electron microscopy. For this study records of all feline urolith submissions from February 2 1998 to July 7 Gleevec 2007 were eligible for inclusion because a total dataset for stones analyzed during that time period was available. Uroliths that were 70% or more urate or uric acid were grouped as ‘urate’ for analysis. Urethral plugs sediment ureteral stones and nephroliths were excluded from analysis. Mixed uroliths of struvite and urate were not classified as urate stones. Statistical.