• Vincent Cottin.
• Hospices Civils de Lyon, Louis Pradel Hospital, National Reference Center for Rare Pulmonary Diseases, Department of Respiratory Diseases, F-69677 Lyon, France; Univ Lyon, Université Lyon I, INRA, UMR754, 8 avenue Rockefeller, F-69008 Lyon, France. Electronic address: vincent.cottin@chu-lyon.fr.
• Clin. Chest Med. 2016 Sep 1; 37 (3): 535-56.

AbstractEosinophilic lung diseases especially comprise eosinophilic pneumonia or as the more transient Löffler syndrome, which is most often due to parasitic infections. The diagnosis of eosinophilic pneumonia is based on characteristic clinical-imaging features and the demonstration of alveolar eosinophilia, defined as at least 25% eosinophils at BAL. Peripheral blood eosinophilia is common but may be absent at presentation in idiopathic acute eosinophilic pneumonia, which may be misdiagnosed as severe infectious pneumonia. All possible causes of eosinophilia, including drug, toxin, fungus related etiologies, must be thoroughly investigated. Extrathoracic manifestations should raise the suspicion of eosinophilic granulomatosis with polyangiitis.Copyright © 2016 Elsevier Inc. All rights reserved.

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