Perineural cyst around S1 nerve root
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Surrounding the right S1 nerve root is a CSF intensity space with associated bony remodelling.
Typical features of a Tarlov cyst.
A Tarlov cyst (also called a perineural cyst) is a CSF filled dilatation of the nerve root sheath at the dorsal root ganglion. These are type II spinal meningeal cysts that are, by definition, extra dural, but contain neural tissue.