Meningeal diverticula of sacral nerve roots (perineurial cysts).
D001416:Back Pain / Q000209:etiology*; D004194:Disease; D004240:Diverticulum; D006801:Humans; D008160:Lumbosacral Plexus; D013126:Spinal Nerve Roots; D052958:Tarlov Cysts
BACKACHE/etiology and pathogenesis; NERVES, SACRAL PLEXUS/diseases