testicular mixed germ cell tumor (Experimental Factor Ontology entry EFO_0010831) is a malignant germ cell tumor that arises from the testis and is characterized by the presence of more than one histologic component. Representative examples include mixed choriocarcinoma and embryonal carcinoma, mixed embryonal carcinoma and seminoma, and mixed yolk sac tumor and teratoma. Also known as: mixed germ cell tumor of testis, mixed testicular germ cell tumour.