Metachronous osteoblastoma of the spine and osteoid osteoma of the femur

Osteoblastoma (OBL) and osteoid osteoma (OO) are usually solitary tumours, only rarely being multicentric. Herein, we report an unusual case in which a typical OBL of the spine was followed by an OO of the femur after a disease-free interval of 5 years. We believe that our unique case represents the first report of a metachronous OBL and an OO, and this presentation may confirm the close correlation between these two rare entities.

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