extracranial germ cell tumor (EK-struh-KRAY-nee-ul jerm sel TOO-mer)
A type of tumor that begins in germ cells (cells that form sperm or eggs) that are found in areas of the body other than the brain. These areas include the ovary, testicle, chest, abdomen, and tailbone. Extracranial germ cell tumors may be benign (not cancer) or malignant (cancer). Extracranial germ cell tumors are most common in children and teenagers and can usually be cured.