Archives of the AFIP -- RadioGraphics

Figure 4: Osteoblastoma of C-3 in a 16-year-old boy with paresthesias of the extremities. Panel A Lateral radiograph shows a markedly expansile lesion involving the spinous process and laminae (arrows), with vague sclerosis suggestive of mineralization. Panel B CT scan reveals the marked expansion of the lesion, which has a defined sclerotic rim (arrows), and its encroachment on the spinal canal. Matrix mineralization (arrowheads), some of which simulates the rings and arcs of chondroid tissue, is also well seen. (C and D) Axial T1-weighted Panel C and sagittal T2-weighted Panel D MR images show the mass (arrows) and its degree of encroachment on the spinal canal (arrowheads in c). Because of its extensive mineralization, the mass has relatively low signal intensity on the T2-weighted image. Panel E Photograph of the gross specimen shows the expanded, lobulated mass (*) with whitish tissue that represents the osteoid matrix.

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