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Axial and sagittal T2 weighted images (a, b) show marked engorgement of the epidural venous plexus (arrow), effacement of the cerebrospinal fluid space and crowding of the cauda equina. A distended urinary bladder is seen up against the lumbosacral spine (asterisk). Following bladder catheterization, axial and sagittal T2 weighted images (c, d) demonstrate resolution of epidural venous plexus engorgement resulting in a patent spinal canal.
