Bladder Stones -------------- Bladder stones, composed of uric acid, require many years to form and may reach unbelievably large sizes (baseball size is not rare). Desert tortoises are prone to this condition because of the urinary bladder's function of storage and resorption of water. Particles of uric acid gradually accumulate within the bladder over years. When these stones become large enough to irritate the bladder lining, mechanically impair urination, interfere with walking or cause pain, most tortoise owners become suspicious that something is wrong. The diagnosis is confirmed with x-rays. Correction involves surgical removal of the stone. The bottom shell must be opened and the body cavity and urinary bladder explored. This is a very complicated procedure and must be performed by an experienced veterinary surgeon.