NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,777 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.

immature teratoma
(IH-muh-CHOOR TAYR-uh-TOH-muh)
A rare type of germ cell tumor (type of tumor that begins in the cells that give rise to sperm or eggs). Immature teratomas often contain several different types of tissue such as hair, muscle, and bone.