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.

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.