thecal sac

noun

Medical Definition of thecal sac

: the membranous sac of dura mater covering the spinal cord and cauda equina and containing cerebrospinal fluid

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“Thecal sac.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/thecal%20sac. Accessed 19 Sep. 2020.

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