Ligamentum FlavumOssification, HeterotopicLaminectomyOssification of Posterior Longitudinal LigamentLigamentsSpinal Cord CompressionLongitudinal LigamentsSpinal StenosisThoracic VertebraeEpidural SpaceRadiculopathySpinal DiseasesCervical VertebraeBrevibacteriumLumbar VertebraeHematomaBrevibacterium flavumDecompression, SurgicalElastic TissueSpinal CanalIntervertebral DiscLumbosacral RegionCystsMyelographySpinal Cord DiseasesThalictrumAnesthesia, Epidural