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Acute eosinophilic pneumonia. (A) The interalveolar septa are thickened by proliferating fibroblasts (features of organizing diffuse alveolar damage) with many intermixed eosinophils and type II pneumocyte hyperplasia and are focally lined by hyaline membranes (arrows) (features of acute diffuse alveolar damage). (B) Numerous eosinophils are in the alveolar space and within hyaline membrane (arrow) and interalveolar septa. Magnification: H&E × 10 (A), ×400 (B).
