Sag/Ax T1 and T2W: Fusiform mass of low T1W and T2W signal surrounds the distal spinal
cord and cauda equina, with effacement of CSF.
Sag/Ax T1W: Post gadolinium, a thick ring of enhancing material surrounds the distal spinal
cord, filling the spinal canal. The process is primarily intradural-extramedullary, but the conus
medullaris also enhances mildly. Distally, abnormal enhancement extends along the nerve
roots of the cauda equina.
Key words: tumor neoplasia mri