A 24-year-old man presented to our clinic with persistent pain and swelling in his thigh. He feels that the swelling rubs against his muscle whenever he bends his knees.

A knee X-ray revealed a bony overgrowth from his thigh bone. He was diagnosed with femoral exostoses (osteochondroma). Surgery was performed to remove the exostoses.

Exostoses (osteochondroma) are extra growths of bone that extend outward from an existing bone. They are the most common benign bone tumors and usually affect the long bones in the leg, shoulder, or pelvis. Unlike many bone spurs, this type of exostosis occurs in younger people, typically between the ages of 10 and 30.