1. Soft tissue swelling: For benign bone tumors, there is usually no surrounding soft tissue erosion, so it cannot be seen on X-ray. Observe the soft tissue mass shadow. Malignant bone tumors are different from benign bone tumors, and in the middle and advanced stages, there will be huge or very obvious soft tissue mass shadows;
2. Periosteal reaction: because Benign bone tumors are slow-growing, less irritating to the periosteum, and usually have no periosteal response. Malignant bone tumors are quite different from benign bone tumors, which can stimulate the periosteum and cause obvious periosteal reaction of the periosteum. For example, osteosarcoma presents with sun-ray shadows or Codman’s triangle, while Ewing’s sarcoma presents onion skin-like appearance;
3. Local bone changes: Because benign bone tumors grow relatively slowly, they produce a compressive or expansive change in the surrounding area, which is usually a very typical feature of benign bone tumors, such as fibrous dysplasia. Malignant bone tumors are different, showing moth-eaten or bone destruction with inhomogeneous density visible on X-ray.