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©2013 UpToDate ® Print Email Acute eosinophilic pneumonia High power photomicrograph of acute eosinophilic pneumonia shows a mixed inflammatory infiltrate expanding the alveolar septa and spilling into adjacent air spaces. The inflammatory infiltrate contains numerous eosinophils and mononuclear cells and is accompanied by a fibrinous exudate resembling hyaline membranes (arrow). Courtesy of Jeffrey L Myers, MD. Normal lung High power photomicrograph shows alveoli containing capillaries within a narrow interstitium. The alveoli are lined with thin, elongated type I pneumoctes (red arrow) and smaller numbers of cuboidal type II pneumocytes (green arrow). Courtesy of Steven E Weinberger, MD.