Osteoblastoma of the thoracic spine on CT

A 15-year-old male who presented with back pain and was found to have an osteoblastoma of the thoracic spine. Image A is an axial CT image of the thoracic spine demonstrating an expansile bony lesion centered within the posterior elements of the spine (arrow). Image B is a coronal section and image C, a sagittal section of the osteoblastoma (arrows).