NCI Dictionary of Cancer Terms
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.
- listen (PIH-nee-oh-sy-TOH-muh)
- A slow growing type of brain tumor that occurs in or around the pineal gland, a tiny organ near the center of the brain.