Inclusion Criteria:a) Symptomatic nerve root cyst diagnosed by MRI b) The capsule of the cyst is intact and the sacral lamina is not defective c) No other diseases of the nervous system, pelvic floor and important organs d) Reconstruction of patients with artificial dural nerve root sleeve reinforcement -  Exclusion Criteria:a) Non-radiotomy cyst or asymptomatic cyst b) The cyst causes severe bone erosion to lamina absorption c) Combined with other diseases of the nervous system, pelvic floor and important organs d) Those who have not used artificial dura mater for nerve root sleeve reinforcement and reconstruction  -