Definition:

breast cancerlisten (brest KAN-ser)

Cancer that forms in tissues of the breast, usually the ducts (tubes that carry milk to the nipple) and lobules (glands that make milk). It occurs in both men and women, although male breast cancer is rare.

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Drawing of female breast anatomy showing  the lymph nodes, nipple, areola, chest wall, ribs, muscle, fatty tissue, lobe, and ducts.

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