Allergic Bronchopulmonary Aspergillosis (Mycosis)

Key Features

• A bronchopulmonary hypersensitivity disorder caused by allergy to fungal antigens

• Usually occurs in atopic asthmatic individuals who are 20–40 years of age or those with cystic fibrosis, in response to antigens of Aspergillus species

Clinical Findings

• Symptoms

  • Dyspnea

  • Wheezing

  • Cough

• Relapses after therapy are common

• Complications

  • Hemoptysis

  • Severe bronchiectasis

  • Pulmonary fibrosis

Diagnosis

• Primary criteria

  • Clinical history of asthma or cystic fibrosis

  • Elevated serum total IgE levels (typically > 1000 international units/mL; a value < 1000 international units/mL may be accepted if all other criteria are met

  • Immediate cutaneous hypersensitivity to Aspergillus antigens or elevated serum IgE levels specific to A fumigatus

  • At least two of the following:

    • Precipitating serum antibodies to Aspergillus antigen or elevated serum Aspergillus IgG by immunoassay

    • Radiographic pulmonary opacities consistent with ABPA

    • Peripheral blood eosinophil count > 500 cells/mcL (0.5 × 10⁹/L)

Treatment

• High-dose corticosteroids (eg, prednisone 0.5–1 mg/kg orally per day) for at least 2 weeks is the treatment of choice

• Depending on the clinical situation, the corticosteroid dose can then be reduced and tapered over 3–6 months

• Relapses are frequent

• Repeated treatment with corticosteroid is not uncommon

• Patients with corticosteroid-dependent disease may benefit from itraconazole or voriconazole