Cancer cells are found in the lobules or ducts. They have not moved to the lymph nodes or spread beyond the breast tissue.
In ductal carcinoma in situ (DCIS), the cancerous cells are in the milk ducts. Most patients do not have symptoms, so DCIS is often found during screening mammograms. Symptoms may include a lump in your breast, nipple discharge, changes in your breast size or color, and breast skin dimpling, puckering, or thickening. About 83 percent of in situ breast cancer is DCIS.4
All women with DCIS are referred for treatment. Treatment may include surgery, radiation, and/or endocrine (hormonal) therapy. About 50 percent, or one-half, of all cases will become an invasive breast cancer (IBC) if not treated.5
Image Credit: TTSZ / iStock / Getty Images
Paget's disease is a rare form of in situ breast cancer. It involves the skin of your nipple and areola (dark skin around your nipple).
Lobular carcinoma in situ (LCIS) also referred to as lobular neoplasia, is not cancer. It is a risk factor (or marker) for invasive breast cancer. Women with LCIS have a higher risk for invasive breast cancer later in life. This risk is not limited to the breast where the LCIS was found; it can occur in either breast. Frequent monitoring and plans to reduce your risk are typically recommended for women with LCIS. Your doctor will discuss what treatment is best for you.