ductal carcinoma in situ
[duck-tul car-sin-O-ma in sy-too]
also called DCIS and intraductal carcinoma. A condition in which cancer cells are in lining of the milk passages (ducts) but have not grown through the duct walls into the nearby tissue. This is a highly curable pre-cancer (or non-invasive form of breast cancer). It is treated with surgery sometimes combined with radiation therapy and/or hormone therapy.