NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,848 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.

contrast material
(KON-trast muh-TEER-ee-ul)
A dye or other substance that helps show abnormal areas inside the body. It is given by injection into a vein, by enema, or by mouth. Contrast material may be used with x-rays, CT scans, MRI, or other imaging tests.