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©2013 UpToDate ® Print Email Acute eosinophilic pneumonia Low power photomicrograph from a patient with acute eosinophilic pneumonia illustrates air space exudate and alveolar septal thickening resembling that seen in the organizing phase of diffuse alveolar damage. Courtesy of Jeffrey L Myers, MD. Normal lung Low power photomicrograph of normal lung tissue shows open alveoli with thin, capillary- containing interstitial spaces. An artery (A) is identifiable by its thick, muscular wall; the accompanying bronchus (B) contains mucoid material and is lined by columnar respiratory epithelial cells. Courtesy of Steven E Weinberger, MD.

©2013 UpToDate ® Print Email Acute eosinophilic pneumonia Low power photomicrograph from a patient with acute eosinophilic pneumonia illustrates air space exudate and alveolar septal thickening resembling that seen in the organizing phase of diffuse alveolar damage. Courtesy of Jeffrey L Myers, MD. Normal lung Low power photomicrograph of normal lung tissue shows open alveoli with thin, capillary- containing interstitial spaces. An artery (A) is identifiable by its thick, muscular wall; the accompanying bronchus (B) contains mucoid material and is lined by columnar respiratory epithelial cells. Courtesy of Steven E Weinberger, MD. 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.