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[Clinical aspects and diagnosis of lumbosacral perineural cysts].

Perineurial cysts are sometimes space-occupying cystic dilatations of the lumbo-sacral nerve roots at or distal to the junction of the posterior root and the dorsal ganglion. The wall is composed of perineurium and neural tissue. We report on 2 cases of upper sacral perineurial cysts with their computed tomography and myelography findings. Indication for operation is discussed: perineurial cysts should only be operated on if their clinical symptoms are clearly attributable to them and other causes like degeneration of the lumbar spine can be excluded.