Urinary stones that are not easily visualized on abdominal plain films are pure uric acid stones, which can completely pass through X-rays and are called negative stones. However, pure uric acid stones can be detected by ultrasound with echo detection. Similarly, a CT scan of the kidneys will not detect pure uric acid stones because the CT scan also uses X-rays for computerized imaging. Therefore, ultrasound is needed to further confirm the diagnosis of pure uric acid stones. Instead of extracorporeal shock wave lithotripsy or surgery, pure uric acid stones can be treated with uric acid-lowering medications to dissolve the stones. Commonly used drugs such as allopurinol tablets or oral sodium citrate granules for stone dissolving treatment. Meanwhile, regular ultrasound examination is needed. If the pure uric acid stone causes obstruction, causing fluid retention in the kidneys, causing acute pain, it is necessary to carry out symptomatic pain relief treatment. One capsule of diclofenac sodium can be used orally once a day to relieve the pain caused by stones.