Fig. 2.

Sagittal T1-weighted (a), sagittal T2-weighted (b) and axial fat-suppressed T2-weighted (c) images demonstrate a lesion involving S2-S4 segments with a large associated presacral soft tissue mass. The lesion is associated with expansion of the spinal canal and left S2-4 neural foramina (star). The mass is predominantly hypointense on T1 and hyperintense on T2 with subtle hazy and linear internal foci of fat signal intensity (short white arrows in a). Sagittal gadolinium enhanced T1-weighted images with fat suppression (d) show minimal internal enhancement with a few patchy areas of enhancement near the sacrum (black arrow).