NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,886 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

extracranial germ cell tumor
(EK-struh-KRAY-nee-ul jerm sel TOO-mer)
A rare cancer that forms in germ cells in the testicle or ovary, or in germ cells that have traveled to areas of the body other than the brain (such as the chest, abdomen, or tailbone). Germ cells are reproductive cells that develop into sperm in males and eggs in females.