What is a Thecal Sac : Definition and Structure The thecal sac is a covering of the spinal canal that is filled with cerebrospinal fluid (CSF). It houses the spinal cord and nerve roots. It is made up of outer arachnoid membrane and inner dura. It is wider in females. The length is approximately until S1 to
High termination of the thecal sac at the mid-L5 level with a small perineural cyst. The conus terminates at the normal L1 level, and the filum terminale is not thickened.
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