Eosinophilia with Lung Involvement in an Elderly Patient with a History of Chronic Obstructive Pulmonary Disease

Eosinophilia with pulmonary involvement is characterized by the presence of peripheral blood eosinophilia, typically >500 cells/mm3, nonspecific pulmonary symptoms, and radiographic evidence of pulmonary disease. Clinical, laboratory, and radiologic features can be overlapping in these diseases, thus, it is wise to approach eosinophilia with pulmonary involvement systematically to determine the diagnosis and provide definitive treatment for a better outcome. The authors present a case of idiopathic chronic eosinophilic pneumonia in a patient with a long history of chronic obstructive pulmonary disease (COPD) which was resolved by corticosteroid.