File:Atypical adenomatous hyperplasia Case 231 (7336388482).jpg

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Description Atypical adenomatous hjyperplasia (AAH) is defined in the WHO Histological Typing of Lung and Pleural Tumors 3rd Ed as follows,: "A focal lesion, often 5 mm or less in diameter, in which the involved alveoli and respiratory bronchioles are lined by monotonous, slightly atypical cuboidal to low columnar epithelial cells with dense nuclear chromatin, inconspicuous nucleoli and scant cytoplasm. AAH is considered to be a precursor of pulmonary adenocarcinoma. It is usually an incidental finding in tumor resection specimens and is separate from the adenocarcinoma. However, AAH changes may sometimes be encountered at the periphery of adenocarcinomas. In this case a tiny nodule of AAH was present at a distance from the adenocarcinoma.
Date
Source Atypical adenomatous hyperplasia Case 231
Author Yale Rosen from USA

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This image was originally posted to Flickr by Pulmonary Pathology at https://flickr.com/photos/30950973@N03/7336388482 (archive). It was reviewed on 3 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

3 October 2019

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current08:02, 3 October 2019Thumbnail for version as of 08:02, 3 October 20192,560 × 1,920 (2.06 MB)Netha Hussain (talk | contribs)Transferred from Flickr via #flickr2commons

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