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ductal carcinoma in situ (DUK-tul KAR-sih-NOH-muh in SY-too)

A noninvasive condition in which abnormal cells are found in the lining of a breast duct. The
abnormal cells have not spread outside the duct to other tissues in the breast. In some cases,
ductal carcinoma in situ may become invasive cancer and spread to other tissues, although it is
not known at this time how to predict which lesions will become invasive. Also called DCIS and
intraductal carcinoma.

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