Figure 5.

Radiographies of osteosarcoma (A) and Ewing's sarcoma (B). Ill defined osteolytic lesion involving metaphysis (osteosarcoma) or diaphysis (Ewing's sarcoma) of long bone is the most common feature. The underlying cortex is commonly partially destroyed, and periosteal new bone is commonly present at the periphery of the tumor. Characteristic permeative bone destruction is often associated with “onion-skin” or “sunburst” periosteal reaction. In Ewing's sarcoma, a large ill-defined soft tissue mass is frequently seen. In addition, expansile bone destruction with soap-bubble appearance might be seen.