Fig. 8

Osteoblastoma. Sagittal T1 weighted MR image (a) demonstrates a low signal lytic lesion involving the T10 vertebral body and posterior elements (orange arrows). The lesion is intermediate to high signal on T2 weighted images (b, c). There is an associated T2 hyperintense component, consistent with an aneurysmal bone cyst (white arrow), which can be seen in 10-20% cases of osteoblastomas