Amazon Web Services (AWS) is a secure cloud services platform, offering compute power, database storage, content delivery and other functionality to help bus... Amazon Web Services (AWS) is a secure cloud services platform, offering compute power, database storage, content delivery and other functionality to help bus... Skip navigation Sign in
Ductal carcinoma in situ (DCIS) is the presence of abnormal cells inside a milk duct in the breast. DCIS is considered the earliest form of breast cancer. DCIS is noninvasive, meaning it hasn't spread out of the milk duct to invade other parts of the breast. DCIS is usually found during a mammogram done as part of breast cancer screening or when there is another concern with a woman's breast.
DCIS is not invasive cancer and is called stage 0 breast cancer. DCIS stays inside the breast milk duct and doesn't spread outside the milk duct into the surrounding normal breast tissue, lymph nodes, or other organs. Women diagnosed with DCIS have a very good prognosis. DCIS usually is treated by lumpectomy followed by radiation therapy. If the DCIS is large, doctors may recommend mastectomy. Removing the opposite breast (prophylactic mastectomy) usually isn't recommended; chemotherapy usually isn't recommended either.