Epidemiology
A benign cartilage tumor of the bone surface, most common in children, adolescents, and young adults. Because it lies on the bone surface, gentle cortical erosion can be expected; what is concerning is rapid growth or a soft-tissue mass.
Basic features
It usually causes local pain or swelling and can gently erode the outer bone (cortex) without aggressively invading the bone.
Usual treatment
Resection or curettage is indicated if there are symptoms, growth, or doubt about a more aggressive cartilage lesion.
Outcomes and prognosis
Local control is very good when it is completely removed, with a low recurrence rate; malignant transformation is exceptional.