The radiological features of osteosarcoma start with an introduction to X-ray imaging. X-rays can show typical new bone formation and bone destruction, which are characteristic features of X-rays. Destruction of bone trabeculae can also be seen on X-rays. Additionally, the density of the tumor tissue increases, leading to a characteristic X-ray known as the Codman's triangle, which occurs when the tumor penetrates the bone and pushes up the periosteum, creating a unique image of Codman's triangle. The second examination includes CT scans and MRI, which are primarily used to determine the nature and extent of the bone tumor, and whether there is infiltration into the surrounding soft tissues. The third radiological examination is a nuclear bone scan, which is primarily important for determining whether the myeloma has metastasized to distant sites.