How to confirm the diagnosis of bone tumor: Because of the low incidence of bone tumor and the inexperience of general orthopedic surgeons, it is easy to misdiagnose, so bone tumor should be diagnosed by bone tumor specialist. The diagnosis of most bone tumors is complicated and sometimes there are certain difficulties because different bone tumors can have similar manifestations, benign bone tumors can become malignant; some bone tumors histological examination shows differentiation benign, but clinically they are highly malignant and often appear early with pulmonary metastasis. There are also some lesions with clinical, x-ray or pathological manifestations similar to bone tumors. Generally speaking, the diagnosis of bone tumor must emphasize the combination of clinical, imaging manifestations and pathology, and comprehensive analysis, in order to make a correct diagnosis. Therefore, if there are symptoms such as pain and swelling and bone tumor is suspected, the first step is to go to a specialist and let them answer the following questions: ① whether it is a bone tumor; ② benign bone tumor and malignant bone tumor; ③ primary bone tumor and metastatic bone tumor.