[Chondroblastoma of the metatarsal bone and its 17-year follow-up].

Chondroblastoma is a rare bone tumor of cartilaginous origin. Metatarsal involvement is very rare, with a few cases. We presented a case of chondroblastoma localized in the fourth metatarsal bone. The patient presented with persistent pain of eight-month duration on the lateral side of his foot, which developed after an inversion ankle sprain. Radiological examination showed a large osteolytic lesion with sclerotic margins in the fourth metatarsal bone. The lesion was treated with extra-articular curettage and autogenous bone grafting. During a 17-year follow-up, the patient had no complaints, and there were no clinical or radiological findings of local recurrence or metastasis.