Lumbosacral RegionSacrumCauda EquinaConus SnailSpinal Cord NeoplasmsPolyradiculopathyLumbosacral PlexusSpinal Cord DiseasesSpinal Cord CompressionSpina Bifida OccultaLumbar VertebraeSpinal CordSpinal DysraphismLaminectomyMyelitis, TransverseNeurilemmomaSpinal Nerve RootsMagnetic Resonance ImagingUrodynamicsMollusk VenomsMuscle WeaknessThoracic VertebraeConotoxinsNeurosurgical ProceduresNeurologic ExaminationTruncus ArteriosusUltrasonography, Prenatal