"DUCTAL" CARCINOMA IN SITU:

This lesion is the much discussed "DCIS". Note that it begins at the level of the lobule and not within the duct.

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Slide 102. A diagrammatic illustration of DCIS. ETD is extralobular terminal duct. ITD is intralobular terminal duct. 
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Slide 103. The upper lobule is III on the previous slide and IV is a fully unfolded lobule in the histologic slide. Photographed at 6.3x magnification 
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Slide 104. A "lacy" solid pattern of DCIS. Photographed at 6.3x magnification 
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Slide 105. The "lacy" pattern of DCIS. Photographed at 63x magnification 

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