Breast Adenocarcinoma at 20x Magnification

The vast majority of breast cancers originate in the glandular tissues of the breast and are classified as adenocarcinomas. Both the lobular tissues, which produce milk, and ductal tissues, which are involved in the transfer of the milk to the nipple, are considered glandular tissues and, therefore, may give rise to adenocarcinomas. The most common variety of adenocarcinoma is known as infiltrating ductal carcinoma, a tumor that usually manifests itself as a single hard lump not easily movable. Nearly 80 percent of all cases of breast cancer diagnosed are infiltrating ductal carcinomas.