TeratomaSacrococcygeal RegionSacrumHemostasis, SurgicalMyelolipomaPelvic InfectionPelvic NeoplasmsRectal DiseasesSurgical EquipmentDysmenorrheaElectrocoagulationRectumHamartomaMeningocelePelvisRetroperitoneal NeoplasmsTesticular NeoplasmsSuture TechniquesRectal NeoplasmsPelvic PainDefecationDermoid CystMediastinal NeoplasmsNeoplasms, Germ Cell and EmbryonalLigationBlood Loss, SurgicalDysgerminomaLaparoscopyOvarian NeoplasmsEmbryonic Stem CellsGerminomaAbnormalities, Severe TeratoidIsochromosomesMesonephromaStruma OvariiCoccyxPluripotent Stem CellsTreatment OutcomeOvarian CystsInduced Pluripotent Stem CellsRetroperitoneal SpaceCell Differentiationalpha-FetoproteinsEndodermal Sinus TumorNeoplasms, Multiple PrimaryOctamer Transcription Factor-3SOXB1 Transcription FactorsChoriocarcinomaParaneoplastic Syndromes, Nervous SystemSpinal NeoplasmsTomography, X-Ray ComputedTwins, ConjoinedSeminomaCarcinoma, Embryonal