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A fusiform mass involves the cauda equina with a further nodule more inferiorly filling the thecal cul de sac. Much of the cauda equina and exiting nerve roots are thickened and enhancing. These regions are isointense on T1 and T2 weighted images with homogeneous and vivid contrast enhancement. No evidence of cyst formation. No evidence of haemorrhage. Bone marrow appears normal. Conus appears normal.