NCIthesaurus gonadal dysgenesis mixed gonadal dysgenesis SNOMEDCT_US_2025_09_01:205682006 A gonadal dysgenesis that is characterized by progressive loss of primordial cells on the developing glands of an embryo, leading to extremely hypoplastic and dysfuctioning gonads resulting in one differentiated gonad and either a streak gonad or streak testis. NCI:C120199 UMLS_CUI:C0018055 DOID:14449 MESH:D006060 disease_ontology