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Definition
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Terminology
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Adenosis tumor/nodular adenosis:
Myoepitheliosis:

Epidemiology
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Clinical features
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Case reports
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Gross description
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Micro description
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Micro images
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Various images


Low power




40 year old pregnant woman, Contributed by: Dr. Semir Vranic


Various images

High power

Late stage with increasing fibrosis and decreasing acini

Features of microglandular adenosis

Myoid differentiation

In sentinel nodes

AFIP Fig 52: ducts dilated at periphery

Fig 56-57: Small ducts with microcalcifications

Fig 58: Retention of myoepithalial-type cells but loss of ductal epithelium

Fig 59: Small bland ducts adjacent to nerve


Fig 53, 55: Intraductal papilloma

Fig 54: Invagination into cystic duct

Fig 194, 195, 197: With LCIS


Fig 70: Normal glands in upper right

Fig 198, 199: With LCIS and microinvasion (arrows)

Smooth muscle actin

Small ducts with microcalcifications


Adenosis tumor

Adenosis tumor


Cytology description
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Positive stains
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Differential diagnosis
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End of Breast - nonmalignant > Adenosis > Sclerosing adenosis



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