A 43-year-old asthmatic woman was hospitalised because of fever, cough, expectorations and asthenia. Chest X-rays showed bilateral pulmonary infiltrates. Peripheral blood eosinophilia was greater than 9 G/l. Bronchoalveolar lavage revealed a massive eosinophilia. The clinical features were consistent with a chronic eosinophilic pneumonia. All the symptoms resolved with the initiation of prednisone treatment. The differential diagnosis of eosinophilic pneumonia is discussed.