Brain tumors that develop from germ cells — the cells that normally give rise to eggs and sperm — occur in children and young adults. These tumors, called central nervous system (CNS) germ cell tumors, manifest as several distinct types. Some, like germinomas, respond well to treatment, while others, like yolk sac tumors and choriocarcinomas, are aggressive and challenging to cure. Collectively, they affect hundreds of children each year in the United States alone.

