Tarlov cysts, also known as perineural cysts, are cerebrospinal fluid (CSF) filled sacs located in spinal canal of S1 to S4 region of vertebrae and can be distinguished from other meningeal cysts by nerve-fiber filled walls. Tarlov cysts are defined as cysts formed within the nerve root sheath at dorsal root ganglion. The cause of formation for these cysts are not clear, and the current theories explaining this phenomenon have not been tested or challenged.
MRI sagittal image of sacral and dorso-lumbar perineural cysts.
MRI image showing a Tarlov cyst.
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