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Photomicrograph (original magnification, ×100; hematoxylin-eosin staining) reveals the following: (A) the bronchioles plugged by mucus and the surrounding alveoli are dilated. Many neutrophils and macrophages were found within the bronchi and surrounding lung parenchyma, indicating acute or chronic infection. (B) Alveoli were enlarged, with a loss of alveolar walls. (C, D): structure of alveoli and mucus accumulation in the bronchioles(200X); (E) HE staining of normal lung.
