https://www.vetsurgeon.org/f/clinical-questions/22924/cholesterol-crystals-in-cat-urine Am treating a 3 year old feline for what seemed to be idiopathic cystitis. 2 urine samples in a row have shown vast numbers of flat, rectangular, crystals, along with a small number of casts. At first I thought they were struvite, but these areen-USTelligent Community 10https://www.vetsurgeon.org/thread/138583?ContentTypeID=1Sun, 21 Jun 2015 19:17:03 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:dbae8960-a229-4dda-973d-556f5859b574John Flynn<p>Unless the urine samples were cysto samples analysed promptly, then I&#39;d be querying contaminants.</p> <p>Otherwise, just checking that no iodine contrast-medium in bladder recently and not on any drugs that could lead to crystals? Regular diet?</p> <p>Doesn&#39;t look like glove talc to me.</p> <p>Finally, I&#39;d be more inclined to imagine an unusual appearance for a regular crystal type (struvite / calcium oxalate) rather than an unusual crystal type (cholesterol) if I was sure that these were genuinely reflective of the in vivo urine situation and the patient was symptomatic.</p> <p>These are just my own uninformed thoughts - be interested to hear what answer is if you find out.</p> <p>PS - small number of casts - what type of casts?</p><div style="clear:both;"></div>