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A 61-year-old Chinese man with long-standing, stable Eosinophilic Granulomatosis with Polyangiitis (EGPA) and asthma, presented with acute hypoxemia and declining obstructive pulmonary function. Elevated serum IgE levels, positive Aspergillus fumigatus specific IgE and CT findings of central bronchiectasis with small airway mucoid impaction confirmed new development of Allergic Bronchopulmonary Aspergillosis (ABPA). The maintenance therapy for EGPA, azathioprine, was discontinued. Prednisolone 0.5 mg/kg/day and Itraconazole improved his symptoms and IgE levels. To our knowledge, ABPA occurring in a patient with EGPA has not been reported. Differentiation of EGPA with asthmatic flare vs ABPA vs asthma with aspergillus hypersensitivity is discussed. Heightened Th2 immunity where eosinophils play a central role may link these conditions.
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