Chapter 15 The breasts/Fig 15.01.jpg

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Normal breast. The majority of the breast is composed of stromal tissue, largely mature adipose and fibrous tissue. Within this lie the physiologically and pathologically important breast epithelial structures, from which most breast lesions are derived. The lobules of the breast form well-defined islands of small tubular structures (acini) (e.g. lower left) surrounded by intralobular stroma. The ducts are lined by a double layer of inner cuboidal or columnar epithelium over a layer of myoepithelial cells (centre).