TeratomaTesticular NeoplasmsSacrococcygeal RegionDermoid CystMediastinal NeoplasmsNeoplasms, Germ Cell and EmbryonalDysgerminomaOvarian NeoplasmsRetroperitoneal NeoplasmsEmbryonic Stem CellsGerminomaAbnormalities, Severe TeratoidIsochromosomesMesonephromaStruma OvariiCoccyxPluripotent Stem CellsSymptom AssessmentDepressionOvarian CystsTreatment OutcomeInduced Pluripotent Stem CellsRetroperitoneal SpaceTomography, X-Ray ComputedCell Differentiationalpha-FetoproteinsNeoplasms, Multiple PrimaryParaneoplastic Syndromes, Nervous SystemEndodermal Sinus TumorOctamer Transcription Factor-3SOXB1 Transcription FactorsChoriocarcinomaSpinal NeoplasmsQuestionnairesSeverity of Illness IndexTwins, ConjoinedSeminomaCarcinoma, EmbryonalBehavioral SymptomsOrbital Neoplasms