There is a risk of recurrence after surgical resection of renal malignant tumors, and the specific risk of recurrence depends on the type and stage of the tumor. The common types of renal malignant tumors include renal pelvis cancer, nephroblastoma and renal clear cell carcinoma, etc. Surgery is the best choice for renal malignant tumors, and once found, it should be aggressively carried out. When the renal tumor is confined within the pericardium, the degree of malignancy is small, and there is usually no recurrence after surgery. However, when the tumor infiltration penetrates the peritoneum, invades the fascia around the kidney, or occurs in the blood or adjacent organs and tissues, recurrence may occur after surgery due to residual tumor cells. Some tumor patients also need chemotherapy and radiotherapy after surgery to further reduce the risk of recurrence. Therefore, for patients with renal malignant tumors after completing treatment, they need to go to regular hospitals for regular review and timely monitoring of recurrence.