Cancer is a very serious malignant tumor. The stage of cancer cannot be seen simply from the pathology report. Cancer patients are divided into early, middle and late stage, which need to be judged by imaging examination and pathological diagnosis after surgery. In early stage cancer patients, the tumor volume is relatively small and there is no spread and metastasis; in middle stage cancer patients, the tumor volume is larger, usually larger than 2cm, there is local infiltration or destruction of local membrane, etc., and local lymph node metastasis occurs, which belongs to the middle stage of cancer; in late stage cancer patients, there is mainly tumor spread and metastasis, and the key is distant lymphatic metastasis and organ metastasis. Metastasis.