Fig. 4

Case 3: radiological findings. a Post-contrast MRI studies show thickening and intense enhancement of the cauda equina nerve roots predominantly along the nerve sheath seen extending from the conus medullaris region down into the thecal sac to the lumbosacral plexus likely representing perineural tumor spread. Heterogeneous marrow signal pattern of the imaged vertebrae predominantly involving the lower cervical and upper thoracic vertebral bodies, showing bright signal intensity in T2- and STIR weighted images and heterogeneous mosaic pattern enhancement in the post-contrast series with no evidence of structural collapse or extra-osseous soft tissue component. b Post-contrast MRI study 33 months post-autologous stem cell transplant shows almost complete resolution of previously described residual thickening and enhancement of cauda equina nerve roots