FIG 9. A, Proton density–weighted sagittal image of 53-year-old woman with aggressive VH of L3 vertebra. There is decrease of signal in L3 vertebral body. There is a large, homogeneous, low-signal extraosseous mass within spinal canal compressing thecal sac. There is growth of tumor superiorly and inferiorly along posterior aspect of L3 vertebral body. Note that there is preservation of intervertebral disk spaces.

B, T2-weighted sagittal images (from same patient as 9A) shows that signal in extraosseous component increases on T2-weighted image. T2-weighted image better shows how tumor extends beyond inferior disk space (arrow).