Cauda EquinaPolyradiculopathySpinal Cord NeoplasmsConus SnailSpinal Cord CompressionPeripheral Nervous System NeoplasmsSpinal Cord DiseasesLaminectomyLumbar VertebraeSacrumLumbosacral RegionSpinal CordNeurilemmomaSpina Bifida OccultaNerve Compression SyndromesSpinal Nerve RootsMyelitis, TransverseSpinal DysraphismMagnetic Resonance ImagingUrodynamicsMollusk VenomsMuscle WeaknessNeurologic ExaminationThoracic VertebraeNeurosurgical Procedures