Long malignant tumor on the foot is considered to be osteosarcoma or chondrosarcoma, which can be found in the thigh or calf side of the obvious mass, local pressure pain, local skin temperature is elevated. Sometimes superficial veins can be seen to be angry and pulsatile beating, the patient usually has obvious pain, especially its night pain is mainly, the boundary of the mass is usually not clear, hard texture, no mobility, do systemic examination can be found some metastatic symptoms. Bone tumor metastasis to the lung CT can be found in the tumor metastatic foci change, as well as there are other malignant manifestations.