MRI
Sagittal T2
Sagittal T1
Axial T2
Axial T1
Sagittal T1 C+ fat sat
Axial T1 C+ fat sat
Ovoid cyst which matches CSF signal at the conus completely filling the spinal canal over a 3.5cm length. The cauda equina roots are displaced peripherally around the lesion with complete effacement of CSF. Bilateral renal pelvis dilatation, likely secondary to neurogenic bladder.