Epidemiology
An uncommon benign cartilage tumor, most frequent in adolescents and young adults. Its rarity means it is confused with other lytic lesions; reviewing the imaging and biopsy together avoids overtreatment.
Basic features
It usually presents as localized pain in the metaphysis of long bones, with a well-defined, eccentric lesion.
Usual treatment
The most common management is curettage with local adjuvants and a bone graft or bone substitute depending on the defect. It is not the only option: because it recurs with some frequency after curettage, en-bloc resection may be preferred in expendable bones (the fibula, a rib, a metatarsal) or after a recurrence, giving safer local control at the cost of sacrificing the segment.
Outcomes and prognosis
The prognosis is favorable, although local recurrence after curettage is not negligible; it does not metastasize.