Spinal Cord NeoplasmsHematopoiesis, ExtramedullarySpinal CordSpinal Cord InjuriesPlasmacytomaSpinal Cord CompressionSpinal Cord DiseasesSarcoma, MyeloidLaminectomySpinal Cord IschemiaParaplegiaPrimary MyelofibrosisThoracic VertebraeSpinal NeoplasmsInjections, SpinalSpinal Nerve RootsTuberculomaLeukemic InfiltrationSpinal NervesCervical VertebraeMotor NeuronsSpinal Cord RegenerationIophendylateMultiple MyelomaMagnetic Resonance ImagingSpinal CanalAnesthesia, SpinalQuadriplegia