Embryonal carcinoma is a type of cancer that occurs in the cells of an embryo. This cancer can be difficult to treat, especially if it has spread to other parts of the body. There are several synonyms for embryonal carcinoma, such as germ cell tumor, primitive cell tumor, and embryonic cancer. Other synonyms include teratocarcinoma, yolk sac tumor, and choriocarcinoma. These tumors can occur in different parts of the body, such as the testicles, ovaries, or mediastinum. Treatment for embryonal carcinoma may involve surgery, chemotherapy, radiation therapy, or a combination of these approaches, depending on its severity and location.