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Here is a small fibroadenoma of the breast. The blue dye
was injected during a radiographic procedure to mark the location of the neoplasm so the
surgeon could find it. |

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This infiltrating ductal carcinoma of the breast is
definitely infiltrating the surrounding breast. The central white area is very hard and
gritty, because the neoplasm is producing a desmoplastic reaction with lots of collagen.
This is often called a "scirrhous" appearance. There is also focal dystrophic
calcification leading to the gritty areas. |

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At high magnification, the infiltrating ductal carcinoma
of breast has pleomorphic cells infiltrating through the stroma. |