Breast cancer is a malignant tumor that starts in the cells of the breast.
A malignant tumor is a group of cancer cells that can grow into invade surrounding tissues or spread metastasize to distant areas of the body. The disease occurs almost entirely in women, but men can get it, too.
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The remainder of this document refers only to breast cancer in women. For information on breast cancer in men, see our document, Breast Cancer in Men.
The normal breast To understand breast cancer, it helps to have some basic knowledge about the normal papilloma dcis of the breasts, shown in the diagram below. The female breast is made up mainly of lobules milk-producing glandsducts tiny tubes that carry the milk from the lobules to the nippleand stroma fatty tissue and connective tissue surrounding the ducts and lobules, blood vessels, and lymphatic vessels.
Most breast cancers begin in the cells that line the ducts ductal cancers. Some begin in the cells that line the lobules lobular cancerswhile a small number start papilloma dcis other papilloma dcis.
The lymph lymphatic system of the breast The lymph system is important to understand because it is one way breast cancers can spread. This system has several parts.
Lymph nodes papilloma dcis small, bean-shaped collections of immune system cells cells that are important in fighting infections papilloma dcis are connected by lymphatic vessels.
Lymphatic vessels are like small veins, except that they carry a clear fluid called lymph instead of blood away from the breast.
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Lymph contains tissue fluid and waste products, as well as immune system cells. Breast cancer cells can enter lymphatic vessels and begin to grow in lymph nodes.
Most lymphatic vessels in the breast connect to papilloma dcis nodes under the arm axillary nodes. Some lymphatic vessels connect to lymph nodes inside the chest internal mammary nodes and those either above or below the collarbone supraclavicular or infraclavicular nodes.
If the cancer cells have spread to lymph nodes, there is a papilloma dcis chance that the cells could have also gotten into the bloodstream and spread metastasized to other sites in the body. The papilloma dcis lymph nodes that have breast cancer, the more likely it is that the cancer may be found in cancer colorectal univ organs as well.
Because of this, finding cancer in one or more lymph nodes often affects the treatment plan. Still, not all women with cancer cells in their lymph nodes develop metastases, and some women can have no cancer papilloma dcis in their lymph nodes and later develop metastases.
Benign breast lumps Most breast lumps are not cancerous benign.
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Still, some may need to be sampled and viewed under a microscope to prove they are not cancer. Fibrocystic changes Most lumps turn out to be fibrocystic changes.
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The term fibrocystic refers to fibrosis and cysts. Fibrosis is the formation of papiloma que es sintomas y tratamiento fibrous tissue, and cysts are fluid-filled sacs.
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Fibrocystic changes can cause breast swelling and pain. Her breasts may feel lumpy and, sometimes, she may notice a clear or slightly cloudy nipple discharge. Other benign breast lumps Papilloma dcis breast tumors such as fibroadenomas or intraductal papillomas are abnormal growths, but they are not cancerous and do not spread outside the breast to other organs.
They are not papilloma dcis threatening. Still, some benign breast conditions are important because women with these conditions have a higher risk of developing breast cancer. General breast cancer terms Here are some of the key words used to describe breast cancer.
Carcinoma This is a term used to describe a cancer that begins in the lining layer epithelial cells of organs like the breast.
Nearly all breast cancers are carcinomas either ductal carcinomas or lobular carcinomas. Adenocarcinoma An adenocarcinoma is a type of carcinoma that papilloma dcis in glandular tissue tissue that makes and secretes a substance. The ducts and lobules of the breast are glandular tissue they make breast papilloma dcis cancers starting in these areas are often called adenocarcinomas.
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Carcinoma in situ This term is used for an early stage of cancer, when it is confined to the layer of cells where it began.
In breast cancer, in situ means that the cancer cells remain confined to ducts ductal carcinoma in situ.
The cells have not grown into invaded deeper tissues in the breast or spread to other organs in the body. Carcinoma in situ of the breast is sometimes referred to as non-invasive or pre-invasive breast cancer because it may develop into an invasive breast papilloma dcis if left untreated.