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=Malignant potential= | =Malignant potential= | ||
==Atypical alveolar hyperplasia== | |||
*Abbreviated ''AAH''. | |||
===General=== | |||
*Generally considered the precursor lesion to ''adenocarcinoma in situ''.<ref name=pmid17618248>{{Cite journal | last1 = Sakuma | first1 = Y. | last2 = Matsukuma | first2 = S. | last3 = Yoshihara | first3 = M. | last4 = Nakamura | first4 = Y. | last5 = Nakayama | first5 = H. | last6 = Kameda | first6 = Y. | last7 = Tsuchiya | first7 = E. | last8 = Miyagi | first8 = Y. | title = Epidermal growth factor receptor gene mutations in atypical adenomatous hyperplasias of the lung. | journal = Mod Pathol | volume = 20 | issue = 9 | pages = 967-73 | month = Sep | year = 2007 | doi = 10.1038/modpathol.3800929 | PMID = 17618248 }}</ref> | |||
===Microscopic=== | |||
Features:<ref name=Ref_WMSP114>{{Ref WMSP|114}}</ref> | |||
*Enlarged alveolar lining cells with: | |||
**Hobnail morphology - free (luminal) surface area > attached/basal surface area. | |||
**Hyperchromasia. | |||
*Limited extent: | |||
**<5 mm. | |||
DDx: | |||
*Adenocarcinoma in situ. | |||
Image: | |||
*[http://www.nature.com/modpathol/journal/v20/n9/fig_tab/3800929f1.html#figure-title AAH (nature.com)].<ref name=pmid17618248/> | |||
==Atypical carcinoid lung tumour== | ==Atypical carcinoid lung tumour== | ||
*[[AKA]] ''carcinoid tumour of the lung''. | *[[AKA]] ''carcinoid tumour of the lung''. |
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