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General
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Terminology
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Atypical apocrine adenosis
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Micro description
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Micro images
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AFIP: circumscribed lesion

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Within a lobule

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Expansion of lobular units with marked apocrine metaplasia ("B" is low power location)

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With sclerosing adenosis

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AFIP: appears infiltrative

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Calcification

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Highly cellular and tumefactive growth pattern

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AFIP: Ducts lined by apocrine cells with large nuclei and prominent nucleoli

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AFIP: Cells have vacuolated cytoplasm, large nuclei and prominent nucleoli

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Androgen receptor positive


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With atypia, contributed by Dr. Semir Vranic

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With atypia: 3x variation in nuclear size

Cytology description
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Positive stains
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Negative stains
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Electron microscopy description
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Differential diagnosis
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End of Breast - nonmalignant > Adenosis > Apocrine adenosis



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