NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,791 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.

brain tumor
(brayn TOO-mer)
The growth of abnormal cells in the tissues of the brain. Brain tumors can be benign (not cancer) or malignant (cancer).

EnlargeDrawing of brain anatomy showing the brain stem, pons, medulla, spinal cord, cerebellum, cerebrum, meninges, ventricles (fluid-filled spaces), and skull.

Anatomy of the brain, showing the cerebrum, cerebellum, brain stem, and other parts of the brain.

EnlargeDrawing of the inside of the brain showing ventricles (fluid-filled spaces), choroid plexus, hypothalamus, pineal gland, pituitary gland, optic nerve, brain stem, cerebellum, cerebrum, medulla, pons, and spinal cord.

Anatomy of the inside of the brain, showing the pineal and pituitary glands, optic nerve, ventricles (with cerebrospinal fluid shown in blue), and other parts of the brain.