Lung, Epithelium, Alveolus - Hyperplasia





comment:
Alveolar epithelial hyperplasia is a proliferation of type II pneumocytes and may be primary ( Figure 1





recommendation:
Lung, Epithelium, Alveolus - Hyperplasia should be diagnosed and given a severity grade whenever present. When the alveolar epithelial hyperplasia is secondary to type I pneumocyte injury or inflammation, it need not be recorded separately unless the pathologist feels that its severity warrants a separate diagnosis. If it is not diagnosed separately, it should be described in the pathology narrative as a component of the inflammatory lesion. If both primary and secondary alveolar epithelial hyperplasia is present in a study, and the pathologist feels that both should be diagnosed, then they must be assigned different terms. This can be accomplished by adding an appropriate modifier, such as "focal." That is, primary alveolar epithelial hyperplasia can be recorded as Lung, Epithelium, Alveolus - Hyperplasia, Focal and secondary alveolar epithelial hyperplasia can be recorded as Lung, Epithelium, Alveolus - Hyperplasia. However, the distinction must be made in the pathology narrative. If the hyperplastic cells have significant features of atypia, the modifier "atypical" should be included in the diagnosis (i.e., Lung, Epithelium, Alveolus - Hyperplasia, Atypical).related links:
Lung - Atypia, Cellularreferences:
Boorman GA, Eustis SL. 1990. Lung. In: Pathology of the Fischer Rat: Reference and Atlas (Boorman GA, Eustis SL, Elwell MR, Montgomery CA, MacKenzie WF, eds). Academic Press, San Diego, CA, 339-367.
Dixon D, Herbert RA, Sills RC, Boorman GA. 1999. Lungs, pleura, and mediastinum. In: Pathology of the Mouse: Reference and Atlas (Maronpot RR, Boorman GA, Gaul BW, eds). Cache River Press, Vienna, IL, 293-332.
Renne, R, Brix A, Harkema J, Herbert R, Kittle B, Lewis D, March T, Nagano K, Pino M, Rittinghausen S, Rosenbruch M, Tellier P, Wohrmann T. 2009. Proliferative and nonproliferative lesions of the rat and mouse respiratory tract. Toxicol Pathol 37(suppl):5S-73S. Abstract: https://www.ncbi.nlm.nih.gov/pubmed/20032296
Web page last updated on: December 07, 2015