The presence of osteosarcoma in the breast may be due to metastasis of osteosarcoma, in which case it is important to seek timely medical treatment and find a professional doctor for standardized diagnosis and treatment. Osteosarcoma is a malignant tumor, often occurring in the distal end of the long bones, the main manifestation of the local persistent and gradually aggravating pain, there may be a local mass. Osteosarcoma is susceptible to metastasis, and the disease develops rapidly, usually through the bloodstream, and often metastasizes to the lungs, breast, liver and other parts of the body. The presence of pathological tissue of osteosarcoma in breast indicates that the primary osteosarcoma has already metastasized, and the condition may have entered the advanced stage, in this case, it is necessary to seek medical treatment in time, and surgical treatment combined with chemotherapy may be chosen as the treatment, so please ask the patients and their family members to follow the doctor’s instructions for treatment.