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Definition
By Mayo Clinic staffInvasive lobular carcinoma is a type of breast cancer that begins in the milk-producing glands (lobules) and then invades surrounding tissues. About 20,000 women are diagnosed with this type of breast cancer each year in the United States. Invasive lobular carcinoma makes up about 15 percent to 20 percent of all breast cancers.
Compared to the more common form of invasive breast cancer — invasive ductal carcinoma — invasive lobular carcinoma is less likely to show up on a mammogram. Although invasive lobular carcinoma tends to be larger at diagnosis, it generally has a more favorable outlook than does invasive ductal carcinoma.
