A malignant germ cell tumor characterized by the presence of at least two different germ cell components. The different germ cell components include choriocarcinoma, embryonal carcinoma, yolk sac tumor, teratoma, and seminoma. It occurs in the ovary, testis, and extragonadal sites including central nervous system and mediastinum. The disease is Monarch Disease Ontology term MONDO_0015864 (mixed germ cell tumor). Also known as: combined germ cell neoplasm, combined germ cell tumor, combined germ cell tumour, mixed germ cell cancer, mixed germ cell neoplasm.