A biphasic neoplasm that arises from the ovary or the testis. It is characterized by the presence of neoplastic germ cells and neoplastic sex cord-stromal cells. It includes the gonadoblastoma and mixed germ cell-sex cord stromal tumor, unclassifiable. The disease is mixed germ cell-sex cord-stromal tumor (MONDO_0002478). Also known as: mixed germ cell-Sex cord neoplasm, mixed germ cell-Sex cord tumor, mixed germ cell-Sex cord tumour, mixed germ cell-Sex cord-stromal neoplasm, mixed germ cell-Sex cord-stromal tumor, mixed germ cell-Sex cord-stromal tumour, mixed germ cell-sex cord-stromal tumor (morphologic abnormality), mixed germ cell-sex cord-stromal tumour (morphologic abnormality).