MRI
A lesion within the thecal sac intimately associated with the cauda equina at the level of L2/L3 has vividly enhancement and prominent flow voids superiorly. It has quite high T2 signal.
The bone marrow signal is low similar but not lower, than muscle. on T1. Diverticular change of the colon noted.
Conclusion
Cauda equina mass with prominent flow voids favours a cauda equina neuroendocrine tumour, over the more common differential diagnoses of myxopapillary ependymoma and schwannoma.
Bone marrow signal suggests florid red marrow (e.g. anaemia) or infiltration (e.g. leukaemia).