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Osteoblastoma in a 12-year-old boy. A, Axial CT image demonstrates an expansile lytic lesion in the pedicle of the C5 vertebra, which involves the C4–C5 facet joint and the left transverse foramen. B, Axial T1-weighted image with gadolinium and fat saturation demonstrates extensive enhancement in the adjacent bone and the left paraspinal soft tissues of the cervical spine, with extension into the epidural space.
