Allergic bronchopulmonary aspergillosis (ABPA) is a hypersensitivity reaction to the fungus Aspergillus fumigatus, a mold that is ubiquitous in the environment.

ABPA occurs in patients with asthma (1%-2% of patients with asthma) or cystic fibrosis (2%-15% of patients with cystic fibrosis). Men and women are affected equally. Most patients are young adults.

Patients present primarily with worsening of asthma symptoms. Some patients may have other symptoms including productive cough, fever, or hemoptysis. Recurrent exacerbations are common.

Central bronchiectasis can be seen on CT scan of the chest, particularly affecting airways in the central half to two-thirds of the chest.

Treatment includes systemic corticosteroids and sometimes antifungal medication.