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**Hobnailed cells. ‡ | **Hobnailed cells. ‡ | ||
**+/-Thick eosinophilic basement membrane. | **+/-Thick eosinophilic basement membrane. | ||
** | **Typically microcystic appearance. | ||
*Usually associated with chronic inflammation. | *Usually associated with chronic inflammation. | ||
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*† May be tubulocystic, polypoid, papillary or fibromyxoid.<ref name=pmid23328975>{{Cite journal | last1 = Piña-Oviedo | first1 = S. | last2 = Shen | first2 = SS. | last3 = Truong | first3 = LD. | last4 = Ayala | first4 = AG. | last5 = Ro | first5 = JY. | title = Flat pattern of nephrogenic adenoma: previously unrecognized pattern unveiled using PAX2 and PAX8 immunohistochemistry. | journal = Mod Pathol | volume = 26 | issue = 6 | pages = 792-8 | month = Jun | year = 2013 | doi = 10.1038/modpathol.2012.239 | PMID = 23328975 }}</ref> | *† May be tubulocystic, polypoid, papillary or fibromyxoid.<ref name=pmid23328975>{{Cite journal | last1 = Piña-Oviedo | first1 = S. | last2 = Shen | first2 = SS. | last3 = Truong | first3 = LD. | last4 = Ayala | first4 = AG. | last5 = Ro | first5 = JY. | title = Flat pattern of nephrogenic adenoma: previously unrecognized pattern unveiled using PAX2 and PAX8 immunohistochemistry. | journal = Mod Pathol | volume = 26 | issue = 6 | pages = 792-8 | month = Jun | year = 2013 | doi = 10.1038/modpathol.2012.239 | PMID = 23328975 }}</ref> | ||
*‡ May be flat.<ref name=pmid23328975/> | *‡ May be flat.<ref name=pmid23328975/> | ||
*Should not have [[necrosis]] or mitoses. | |||
DDx: | DDx: | ||
*[[Urothelial carcinoma]], microcystic and nested variants. | *[[Urothelial carcinoma]], microcystic and nested variants. |
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