Coloured magnetic resonance imaging (MRI) scan of the breasts of a 50 year old female patient lobular carcinoma in situ (LCIS, light blue) in the right breast (left). Despite the name, LCIS is not a type of breast cancer. Instead it means there are changes in the cells lining the lobules, or milk glands, that indicate a higher risk of developing breast cancer in the future. LCIS is most common in premenopausal women. Although most women with LCIS will not go on to develop breast cancer, they are more closely monitored than the general population with regular breast exams and mammograms.