Lobular means that the unusual cells are in the lobules, the parts of the breast capable of making milk. It is a diagnosis that means you are at increased risk of developing breast cancer. Lobular carcinoma in situ LCIS is a noninvasive precancer located in the lobule, the parts of the breast capable of making milk Under the microscope, LCIS appears as a bunch of small, round cells stuffing the lobules, which normally don't contain any cells. If there are only a few cells and they're not too odd-looking, you have lobular hyperplasia.
Lobular carcinoma in situ (LCIS) - Symptoms and causes - Mayo Clinic
Lobular carcinoma in situ Lobular carcinoma in situ Lobular carcinoma in situ LCIS develops in a milk-producing gland lobule and does not spread into nearby breast tissue. Lobular carcinoma in situ LCIS is an uncommon condition in which abnormal cells form in the milk glands lobules in the breast. But being diagnosed with LCIS indicates that you have an increased risk of developing breast cancer. LCIS usually doesn't show up on mammograms.