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| ==Intraductal papilloma== | | ==Intraductal papilloma== |
| *[[AKA]] ''papilloma''. | | *[[AKA]] ''papilloma''. |
| ===General===
| | {{Main|Intraductal papilloma}} |
| *May cause nipple discharge.<ref>{{Cite journal | last1 = Zervoudis | first1 = S. | last2 = Iatrakis | first2 = G. | last3 = Economides | first3 = P. | last4 = Polyzos | first4 = D. | last5 = Navrozoglou | first5 = I. | title = Nipple discharge screening. | journal = Womens Health (Lond Engl) | volume = 6 | issue = 1 | pages = 135-51 | month = Jan | year = 2010 | doi = 10.2217/whe.09.81 | PMID = 20050819 }}</ref>
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| *Similar to ''[[papillary hidradenoma]]'' of the [[vulva]].
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| ===Microscopic===
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| Features:
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| *True papillae - nipple-shaped structures with fibrovascular cores.
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| *Intraductal proliferation of epithelial and myoepithelial elements.<ref name=pmid2123505>{{Cite journal | title = Adenoma of Nipple. | journal = Br Med J | volume = 1 | issue = 5330 | pages = 563 | month = Mar | year = 1963 | doi = | PMID = 20789667 | PMC = 2123505 | url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2123505/?page=1 }}</ref>
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| Notes:
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| *Lacks florid hyperplasia.<ref>URL: [http://surgpathcriteria.stanford.edu/breast/nippleadenoma/printable.html http://surgpathcriteria.stanford.edu/breast/nippleadenoma/printable.html]. Accessed on: 6 August 2011.</ref>
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| *May degeneration and hyalinize to form a ''sclerosing papilloma''.
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| DDx:
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| *Intraductal papilloma with [[florid epithelial hyperplasia]].
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| *Intraductal papilloma with [[atypical ductal hyperplasia]]. †
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| *Intraductal papilloma with [[ductal carcinoma in situ]]. †
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| *[[Invasive papillary carcinoma of the breast]].
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| † Size criteria are different in papillomas.
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| ====Images====
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| <gallery>
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| Image:Papillary_hidradenoma_-_low_mag.jpg | Papillary hidradenoma - low mag. (WC/Nephron)
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| Image:Papillary_hidradenoma_-_very_high_mag.jpg | Papillary hidradenoma - very high mag. (WC/Nephron)
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| </gallery>
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| ==Lymphocytic mastitis== | | ==Lymphocytic mastitis== |