Fig. 11

Giant cell tumor. Sagittal (a) and axial (b) CT images demonstrate a well-defined, expansile lytic lesion involving the right posterolateral aspect of the T10 vertebral body and right pedicle. No discrete sclerotic rim is seen around the lesion margins.  Sagittal and axial MR images demonstrate a homogenous, well defined mass (orange arrows) in the posterior aspect of T10, with low signal on T1- (c, d) and low to intermediate signal characteristics on T2- (e) weighted sequences. A trace amount of increased signal is seen in the adjacent marrow, consistent with mild marrow edema (white arrows)