Worrisome Mass on a Young Lad's Tibia

A 13-year-old boy has a mass on his calf that has been increasing in size. A radiolucent object is visible on his right tibia.

Can you guess the nature of the mass, and whether it is malignant?

To see the all of the imaging and the complete case report, republished with permission from the Hospital for Special Surgery in New York City, click here.