Ligamentum FlavumOssification, HeterotopicCervical VertebraeLaminectomySpinal Cord CompressionOssification of Posterior Longitudinal LigamentLongitudinal LigamentsLigamentsSpinal StenosisSpinal DiseasesThoracic VertebraeRadiculopathyEpidural SpaceLumbar VertebraeDecompression, SurgicalSpinal InjuriesSpinal CanalBrevibacteriumHematomaIntervertebral DiscBrevibacterium flavumElastic TissueSpinal Cord DiseasesMyelographySpineLumbosacral RegionCystsThalictrumAnesthesia, Epidural