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a: Tethered cord syndrome: conus at the normal level (L1), fatty filum suggestive of tethered cord syndrome (Sagittal view lumbar spine, T1 weighted MRI). b: Tethered cord syndrome: the thickened filum terminale at the L2 level, just before division. (Intraoperative photograph of the lumbar spine thecal sac and the durotomy).