ureterolith

例句：

1. 1. He was diagnosed with a kidney stone and had to undergo surgery.
   他被诊断出患有肾结石，并不得不接受手术。
2. 2.The patient's condition worsened after the surgery, and he needed to be hospitalized again.
   手术后，患者的病情恶化，需要再次住院。
3. 3. Ureteroliths are often caused by high levels of uric acid in the body.
   输尿管结石通常是由于体内尿酸水平过高引起的。