Synovial CystCystsPolyradiculopathySpinal DiseasesZygapophyseal JointNerve Compression SyndromesHypoglossal Nerve DiseasesLaminectomyLumbar VertebraeYolk SacSpinal Cord CompressionCyst FluidDecompression, SurgicalHip ContractureRadiculopathyOdontoid ProcessAtlanto-Axial JointCauda EquinaOvarian CystsSpinal Nerve RootsSpondylolisthesisEpidermal CystMagnetic Resonance Imaging