Figure 11.

Sagittal T1-weighted MR image (a) shows abnormal hypointensity related to invasion by a paraspinal mass (spindle cell sarcoma). The cortical margins of the pedicles are attenuated (yellow arrows) in keeping with erosive changes of the mass invading through the neural foramina into the lateral epidural space. The postcontrast T1-weighted MR image with fat-saturation (b) shows heterogeneous enhancement of the mass. Marrow infiltration and neuroforaminal involvement (red arrows) is well seen as hyperintense signal on the STIR MR image (c).