Paget's Disease - Paget's Disease is an uncommon type of cancer involving the nipple . It is characterized by changes in the skin of the nipple and surrounding areola , such as flaking, peeling, and reddening, and almost always is accompanied by a tumor underneath the nipple-areolar complex . This is a very rare type of breast cancer - discharging or painful nipples are not usually signs of this disease. Click here for a picture of what a nipple with Paget's Disease looks like. Invasive Carcinoma - Invasive Carcinoma is any type of carcinoma that has grown outside the duct wall into the surrounding tissues .
Invasive carcinoma has the potential to spread to other parts of the body.
It grows as single files of cells in the breast, and for this reason may be more difficult to feel or see on a mammogram than invasive-ductal cancer. It is easily identifiable as cancer by a trained pathologist , is slow to spread, and has a very good prognosis . Medullary - This type of cancer usually has very well defined margins . It may feel like a hard, moveable marble in the breast. Because the entire breast is firm, no specific lump can be felt or seen on a mammogram and this cancer is sometimes mistaken for infection.