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 most often detected at screening mammography. In a few cases, DCIS may cause: • A lump or thickening in or near the breast or under the arm • A change in the size or shape of the breast
Treatment: In most cases, treatment options for DCIS include: • Lumpectomy and radiation therapy