Ligamentum FlavumEpidural SpaceOssification, HeterotopicLaminectomySpinal Cord CompressionOssification of Posterior Longitudinal LigamentLigamentsLongitudinal LigamentsSpinal StenosisThoracic VertebraeRadiculopathySpinal DiseasesAnesthesia, EpiduralSpinal CanalLumbar VertebraeCervical VertebraeLumbosacral RegionBrevibacteriumHematomaBrevibacterium flavumDecompression, SurgicalElastic TissueMyelographySpinal Cord DiseasesIntervertebral DiscCystsThalictrumNeedles