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NCI Dictionary of Cancer Terms

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breast  listen  (brest)

  Glandular organ located on the chest. The breast is made up of connective tissue, fat, and breast tissue that contains the glands that can make milk. Also called mammary gland.

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Drawing of female breast anatomy showing  the lymph nodes, nipple, areola, chest wall, ribs, muscle, fatty tissue, lobe, ducts, and lobules.
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Anatomy of the male breast; drawing shows the nipple, areola, fatty tissue, ducts, nearby lymph nodes, ribs, and muscle.