Renal pelvis cancer staging is usually judged by imaging modalities such as CT, MRI, ultrasound and section biopsy. Renal pelvis cancer staging is mainly used to judge the degree of development of the tumor before surgery, which can be observed through CT scanning, ultrasound and magnetic resonance imaging modalities to observe the specific situation of the tumor. For example, whether the tumor is confined in the renal pelvis, or has spread to the outside, or has broken through the peritoneum and invaded the surrounding, or has had other metastases. In addition, there is a kind of pathological staging. That is, the tumor or even the whole kidney in the diseased area is removed through surgery, and usually the standard surgery is to remove the kidney, ureter and bladder parts. And then the degree of development of the tumor will be observed through the form of slice biopsy. Therefore, patients are advised to go to regular hospitals for examination.