A germ cell tumor arising from the testis. Representative examples include teratoma, seminoma, embryonal carcinoma, and yolk sac tumor. The disease is Monarch Disease Ontology entry MONDO_0010108 (testicular germ cell tumor). Also known as: TGCT, germ cell neoplasm of testis, germ cell neoplasm of the testis, germ cell tumor of testis, germ cell tumor of the testis, germ cell tumors, somatic, germ cell tumour of testis, germ cell tumour of the testis.