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The thecal sac or dural sac is the membranous sheath of dura mater that surrounds the spinal cord and the cauda equina. The thecal sac contains the cerebrospinal fluid in which the spinal cord 'floats'.
- "tethered cord". http://www.neuroandspine.com/conditions/pediatric-neurosurgery/tethered-cord. External link in
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