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  • Note the yellow epidural fat (black arrows) surrounding the meninges (white arrows) and extending along the nerve roots. DRG = dorsal root ganglion.
  • Axial T2 image through the lumbar spine, annotated in the next image. Note that the epidural space is most prominent surrounding the exiting nerves and along the dorsal thecal sac. As the ligamentum flavum thickens it can narrow the epidural space.
  • Yellow = Epidural fat; blue = dura/arachnoid; red = exiting nerve with dorsal root ganglion; green = ligamentum flavum
  • Note the epidural space on a sagittal T2, annotated on the next image.
  • Yellow = dorsal epidural fat
  • Note how severe ligamentum thickening obliterates the dorsal epidural fat in this case.