"DUCTAL" HYPERPLASIAS:

Blunt Duct Adenosis.

This entity appears in the histologic preparation as a cluster of bigger structures, so pathologists called it ductal. However, the microarchitecture showed it to be an abnormal terminal duct lobular unit. The conventional pathologic names of these have been retained here.

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Slide 80. In this slice a curving duct (D) is noted. At the arrow a terminal duct is seen from which a primitive lobule arises resembling a bunch of bananas. Photographed at 8x magnification.
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Slide 81. The corresponding histologic slide shows large irregular ductules. The arrow points to the terminal duct. Photographed at 6.3x magnification.
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Slide 82. At higher magnification the irregular coarser ductules show slight ingrowth into the lumens. This is called BLUNT DUCT ADENOSIS (BDA). Most pathologists consider BDA a benign condition but some consider it the earliest precancerous lesion to ductal carcinoma. Photographed at 25x magnification.

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