The variations in the X-ray appearance of osteosarcoma are quite large, but the basic characteristics are a mix of osteolytic destruction and pure bony changes. In most cases, besides the mixed changes, there is also destruction of the bone cortex and invasion of soft tissues, with visible periosteal reaction. The epiphysis has a certain blocking effect on the tumor, hence it rarely crosses the epiphyseal line. On the X-ray, changes indicative of skip metastasis can be seen, along with typical Codman's triangle or sunburst patterns. Beneath the periosteum, there are fine, needle-like sunburst radiating changes, which are fairly typical radiographic changes of osteosarcoma and are generally used to diagnose the condition.