Ductal carcinoma in situ is a non-invasive breast cancer where abnormal cells are contained in the lining of the breast milk duct.
Invasive ductal carcinoma is when those abnormal cells have invaded surrounding tissue.
Triple negative breast cancer means tumor cells are negative for progesterone, estrogen and HER2/neu receptors.
Inflammatory breast cancer cancer affects the skin, which may look red, swollen or dimpled, or feel warm, according to the IBC Network Foundation. The American Cancer Society’s website said it accounts for 1 to 5 % of all breast cancers.
Metastatic breast cancer means cancer has spread beyond the breast.
Medullary carcinoma, just 3 to 5% of all breast cancer types, feels spongy and usually shows up on a mammogram.
Tubular carcinoma, about 2% of all breast cancers, also feels spongy. It's typically found in women 50 and up and is responsive to hormone therapy.
Mucinous carcinoma represents 1% to 2% of all breast cancers. It's poorly defined but has a favorable prognosis.
Paget disease of the breast or nipple is also a rare cancer. It affects the nipples and areola. People with Paget disease may have one or more tumors inside the same breast.
Phyllodes tumors are rare, but usually benign, breast tumors that develop in the connective tissue of the breast.
Angiosarcoma accounts for less than 1% of all breast cancers. It starts in cells that line blood vessels or lymph vessels (The Mayo Clinic website said it can resemble a bruise) but can involve the breast tissue or the skin of the breast.