Clinical manifestations and diagnosis of allergic bronchopulmonary aspergillosis
- Praveen Akuthota, MD
Praveen Akuthota, MD
- Associate Clinical Professor
- University of California, San Diego
- Peter F Weller, MD, MACP
Peter F Weller, MD, MACP
- Editor-in-Chief — Infectious Diseases
- Section Editor — Tropical Medicine
- William Bosworth Castle Professor of Medicine
- Harvard Medical School
- Professor of Immunology and Infectious Diseases
- Harvard T. H. Chan School of Public Health
- Section Editors
- Carol A Kauffman, MD
Carol A Kauffman, MD
- Section Editor — Fungal Infections
- Professor of Internal Medicine
- University of Michigan Medical School
- Veterans Affairs Ann Arbor Healthcare System
- Peter J Barnes, DM, DSc, FRCP, FRS
Peter J Barnes, DM, DSc, FRCP, FRS
- Editor-in-Chief — Pulmonary and Critical Care Medicine
- Section Editor — Asthma
- Professor of Medicine
- National Heart and Lung Institute, Imperial College, London
Allergic bronchopulmonary aspergillosis (ABPA) is a complex hypersensitivity reaction in response to colonization of the airways with Aspergillus fumigatus that occurs almost exclusively in patients with asthma or cystic fibrosis (CF) [1-4]. In chronic cases, repeated episodes of bronchial obstruction, inflammation, and mucoid impaction can lead to bronchiectasis, fibrosis, and respiratory compromise .
The pathophysiology, clinical manifestations, and diagnosis of ABPA will be reviewed here. The management of ABPA and general issues related to bronchiectasis are discussed separately. (See "Treatment of allergic bronchopulmonary aspergillosis" and "Clinical manifestations and diagnosis of bronchiectasis in adults" and "Treatment of bronchiectasis in adults".)
The prevalence of allergic bronchopulmonary aspergillosis (ABPA) among patients with persistent asthma is estimated at 1 to 2 percent, although rates up to 28 percent have been reported [1,4,6]. Reported rates are higher in patients seen in asthma clinics and those admitted to the hospital with an asthma exacerbation . Among patients with cystic fibrosis, reported prevalences range from 2 to 9 percent [1,5,7-10].
Rarely, ABPA occurs in patients with bronchiectasis, chronic granulomatous disease, hyperimmunoglobulinemia E, and in lung transplant recipients [4,11-13].
PATHOLOGY AND PATHOGENESIS
Allergic bronchopulmonary aspergillosis (ABPA) is characterized pathologically by mucoid impaction of the bronchi, eosinophilic pneumonia, and bronchocentric granulomatosis in addition to the histologic features of asthma [5,14]. Areas of eosinophilic pneumonia are occasionally found, although not a major feature of the disease . Septated hyphae with acute dichotomous branching may be seen in the mucus-filled bronchial lumen, but fungi do not invade the mucosa. Aspergillus is cultured from the sputum in up to two-thirds of patients with ABPA, but hyphae may not be seen by direct microscopy. (See "Bronchocentric granulomatosis".)
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- PATHOLOGY AND PATHOGENESIS
- CLINICAL FEATURES
- Signs and symptoms
- Pulmonary function testing
- Diagnostic criteria
- Step-wise evaluation
- Diagnosis of allergic bronchopulmonary mycosis
- Diagnosis of ABPA in cystic fibrosis
- DIFFERENTIAL DIAGNOSIS
- SOCIETY GUIDELINE LINKS
- INFORMATION FOR PATIENTS
- SUMMARY AND RECOMMENDATIONS