Definition

A rare type of cancer that is made up of at least two different types of germ cell tumors (tumors that begin in cells that form sperm or eggs). These may include choriocarcinoma, embryonal carcinoma, yolk sac tumor, teratoma, and seminoma. Mixed germ cell tumors occur most often in the ovary or testicle, but they may also occur in the chest, abdomen, or brain.