invasive lobular carcinoma
also called infiltrating lobular carcinoma. A cancer that starts in the milk-producing glands (lobules) of the breast and then breaks through the lobule walls and grows into the nearby fatty tissue. From there, it may spread elsewhere. About 1 in 10 invasive breast cancers are invasive lobular carcinomas. This type of cancer can be hard to detect by mammogram. See also mammogram.