If you have kidney cancer and remove the whole kidney, it may still recur. If you have kidney cancer and no metastasis is found under imaging, you may still have recurrence after removing the whole kidney. Cancer cells are inherently invasive and metastatic, even in early stage of kidney cancer, there may be potential metastasis, just that it cannot be detected by current imaging examination. Just because a patient has a kidney removed through surgery does not mean that the cancer cells are gone. The fact is that cancer cells may recur again as long as there is a breeding ground for them. Therefore, after removing the whole kidney, patients should undergo regular checkups, one every three months in the first year of surgery, and then once every six months in the second year, with ultrasound and CT imaging as the main tests, supplemented by biochemical laboratory tests. If the patient is not feeling well, he/she should consult the doctor for examination and early treatment.