Figure 4.

A 15-year-old girl with a 2-month history of left leg pain found to have osteosarcoma. (A) This AP radiograph shows the poorly marginated, predominantly sclerotic osteosarcoma with exuberant sunburst periosteal reaction. (B) This coronal gadolinium-enhanced MR image shows the intramedullary extent of the tumor. Non-enhancing areas in the medullary canal correspond to ossified and sclerotic components of this bone-forming tumor. Note the sharp distal tumor margin (arrow) sometimes seen in osteosarcoma. (C) This axial gadolinium-enhanced MR image shows the sunburst periosteal reaction surrounding the sclerotic marrow tumor.