Lobular Carcinoma In Situ (LCIS) is a condition where abnormal cells are found in the lobules of the breast. These lobules are the glands that produce milk. While LCIS is not considered breast cancer, it indicates an increased risk of developing breast cancer in the future. Diagnosis of LCIS typically occurs through a breast biopsy, where tissue samples are examined under a microscope. Treatment options may include regular monitoring or preventive measures, such as medication or surgery, depending on individual risk factors and preferences.