Perineural cyst around S1 nerve root

Case contributed by Frank Gaillard
Diagnosis certain

Surrounding the right S1 nerve root is a CSF intensity space with associated bony remodeling.

Typical features of a Tarlov cyst. 

Case Discussion

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.

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