A 68 year-old woman with dyspnea and cough had been treated with inhaled corticosteroids for X-15 years, but her symptoms worsened in X year. High-resolution chest CT revealed small centrilobular nodules in the right upper lobe in March X year. The patient was diagnosed with asthma and diffuse panbronchiolitis and treated with inhaled corticosteroids, a long-acting beta agonist, and clarithromycin, but her condition did not improve and her peripheral blood eosinophil count increased. In August X year, we performed a transbronchial biopsy of the right upper lung. Histopathological examination revealed eosinophilia in the bronchial secretions and mild nonspecific inflammatory changes. The diagnosis was bronchial asthma associated with bronchiolitis. The patient was treated successfully with mepolizumab.
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