Ductal carcinoma in situ (DCIS) is a non-invasive breast cancer that starts in the milk ducts. In this condition, abnormal cells are found in the lining of the ducts but have not spread to surrounding breast tissue. DCIS is often detected through mammograms and is considered an early form of breast cancer. While DCIS is not life-threatening, it can increase the risk of developing invasive breast cancer in the future. Treatment options may include surgery, radiation therapy, or hormone therapy, depending on individual circumstances and the characteristics of the DCIS. Regular monitoring is also essential for managing this condition.