Refers to the ratio of the diameter of the spinal cord to the diameter of the thecal or CSF sac surrounding the cord at a designated level of the spine. Typically this is used when evaluating a level for risk of tethering due to constriction by the dura of the CSF space surrounding the spinal cord. The cord-sac ratio is obtained by dividing the sagittal diameter of the spinal cord by the sagittal diameter of the expanded thecal sac.
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