NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,990 terms related to cancer and medicine.

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atypical ductal hyperplasia
(AY-TIH-pih-kul DUK-tul HY-per-PLAY-zhuh)
A benign (not cancer) condition in which there are more cells than normal in the lining of breast ducts and the cells look abnormal under a microscope. Having atypical ductal hyperplasia increases the risk of breast cancer. Also called ADH and atypical ductal breast hyperplasia.