Medical textbooks have more definitive characteristic descriptions of imaging of benign tumors of bone, including well-defined borders, rare soft tissue masses, little periosteal reaction, and slow rate of destruction. In terms of clinical probability, this is correct. That is to say: most probabilities consider benign under the imaging presentation of all benign bone tumors. However, in the actual clinical cases, it is found that many of them that look very definite benign on imaging are malignant in the final pathology and diagnosis. Similar phenomenon is also mentioned in domestic bone tumor books and in foreign literature. The main reasons are: firstly, at present, people pay attention to health checkups and unintentionally find bone tumors, and in the early imaging performance, these “malignant bone tumors” show benign imaging features, but with the development of tumors, malignant tendency gradually appears. Secondly, there are few doctors specialized in bone tumors in general, and even fewer experienced ones (there are not more than 1000 expert bone tumor doctors in the whole China). Just based on the descriptions in general textbooks, because there are not many bone tumor cases in general, most doctors are not experienced and do not understand some signs in details, so they are prone to make misdiagnosis based on some manifestations and initial impressions. Theoretically, in the diagnosis of bone tumors, pathological specimens must be obtained for diagnosis. And the pathological specimens must be obtained correctly. In bone tumors, there are still about 15-30% of clinical errors due to inability to obtain correct tissue specimens in puncture biopsy. Therefore, the diagnosis and treatment of bone tumors must be diagnosed and managed from the beginning by a very clinically experienced bone oncologist. Otherwise, there will be a high probability of misdiagnosis and management errors, and the consequences are very serious.