CT is a routine examination tool in bone tumor diagnosis. By performing tomography on the lesion, it can: 1. clearly show the location and extent of the tumor; 2. clearly show the relationship between the tumor and muscles, organs, nerves and blood vessels; 3. clearly show the internal structure of the tumor; 4. be sensitive to the micro bone destruction, the extent of lesion involvement and the density value inside the bone destruction, and can show earlier than plain film It can show the extent of bone cortex and joint surface destruction, clarify the extra-bony and intramedullary invasion, and detect soft tissue masses at an early stage. In addition, it can also show the blood supply of the tumor by CT-enhanced scan, which can provide a basis for treatment planning and preoperative embolization of the blood supply artery. CT intensification scan refers to rapid and continuous scanning after rapid injection of contrast agent through a vein with a high-pressure syringe to observe the changes of blood supply in the arterial and venous phases of the lesion and increase the contrast between the lesion and the surrounding normal tissues to facilitate the detection of the lesion and differential diagnosis. CT intensification scan has become a routine examination for bone tumors.