Source:http://linkedlifedata.com/resource/umls/id/C0520720
MSH: Perineurial cysts commonly found in the SACRAL REGION. They arise from the PERINEURIUM membrane within the SPINAL NERVE ROOTS. The distinctive feature of the cysts is the presence of spinal nerve root fibers within the cyst wall, or the cyst cavity itself.,NCI: Cyst of the nerve roots filled with cerebrospinal fluid, usually located in the sacral area of the spine.