The ureter is the channel for the flow of urine. Urine produced by the kidneys is transported downward through the ureter to the bladder after pooling in the renal pelvis, and then excreted with the help of the urethra. When stones are present in the ureter, the flow of urine transportation will be affected, and urine produced by the kidneys collects on the proximal side of the stones, causing fluid retention and dilatation of the kidneys. In severe cases, the renal parenchyma can be compressed, resulting in thinning of the parenchyma thickness, impaired function of the renal units, and ultimately affecting the renal function of the affected side. Patients are advised to actively manage ureteral stones, relieve obstruction, and relieve hydronephrosis.