If the parapelvic cyst is small, it can be clinically observed and regularly reviewed by ultrasound to know the change of its size without special treatment; if the cyst is large and causes hydronephrosis by compressing the renal pelvis, then surgery is recommended. 1. Small cysts: small cysts usually do not cause obvious damage to the body, patients usually have no discomfort symptoms, and generally do not cause pressure on the renal pelvis. In this case, it is enough to review the ultrasound once in 6 months to find out the changes in the size of the cyst. 2. Large cysts: If the cysts are large, for example, more than 4cm in diameter, it is easy to compress the renal pelvis, resulting in hydronephrosis. In this case, laparoscopic decompression surgery for renal cyst is recommended to relieve the pressure of cyst on renal pelvis. All in all, patients with parapelvic cysts need to go to the hospital for examination in time, and according to the specific conditions of the cysts, it is more appropriate for the professional doctors to make the treatment plan.