In ductal carcinoma in situinfo-icon, also called DCISinfo-icon, abnormalinfo-icon cells are found in the lining of the milk ducts, the tubes that carry milk to the nippleinfo-icon. DCIS is also called intraductal carcinomainfo-icon
 
Unlike in invasive disease, the cancer in DCIS has not broken through the walls of the milk ducts to surrounding healthy breast tissueinfo-icon. DCIS is considered stageinfo-icon 0 because it is “in situinfo-icon,” meaning the cancer remains in the area where it began. DCIS is the most common type of in situ breast cancer.
 
Look below for more information from LBBC about DCIS.