[Osteoblastoma of the 1st metatarsal bone. Apropos of a case].

Metatarsal localisation of osteoblastoma is rare. We report a case of a sixteen years old girl. The foot was swollen but unpainful. The plain film showed an extensive, osteolytic tumor of the whole of the first metatarsal bone. The radiological diagnosis could be discussed with an aneurysmal cyst, a chondroma, a desmoplastic fibroma, a fibrous dysplasia, an angioma. The total resection was possible without opening of the tumor and reconstruction was possible with a tibial graft. The pathological diagnosis was benign osteoblastoma. Recovery was uneventful.