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==General== | ==General== | ||
*Lack papillae. | *Lack papillae. | ||
===Classification of flat urothelial lesions=== | |||
The World Health Organization classification is:<ref name=pmid19762067>{{Cite journal | last1 = Hodges | first1 = KB. | last2 = Lopez-Beltran | first2 = A. | last3 = Davidson | first3 = DD. | last4 = Montironi | first4 = R. | last5 = Cheng | first5 = L. | title = Urothelial dysplasia and other flat lesions of the urinary bladder: clinicopathologic and molecular features. | journal = Hum Pathol | volume = 41 | issue = 2 | pages = 155-62 | month = Feb | year = 2010 | doi = 10.1016/j.humpath.2009.07.002 | PMID = 19762067 }}</ref> | |||
*Reactive urothelial atypia. | |||
*Flat urothelial hyperplasia. | |||
*Urothelial atypia of unknown significance. | |||
*[[Urothelial dysplasia]] (low-grade dysplasia). | |||
*Urothelial carcinoma in situ (high-grade dysplasia). | |||
*Invasive [[urothelial carcinoma]]. | |||
==Microscopic== | ==Microscopic== |
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