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Pathology of acute interstitial pneumonia (AIP): (A) Enlargement of the alveolar duct due to collapse of the alveolar sac is a common feature of AIP. (B) Hyaline membranes are seen in the enlarged alveolar ducts. (C) Higher magnification of the alveolar sac shows its collapse. Note the presence of type II cell hyperplasia. (D) In the organizing phase, alveolar septa are thickened by a fibroblastic proliferation.
