Pathology of allergic bronchopulmonary aspergillosis

Area of Science:

• Pulmonology
• Immunology
• Infectious Diseases

Background:

• Allergic bronchopulmonary aspergillosis (ABPA) is a hypersensitivity disorder affecting the lungs.
• It is primarily diagnosed in patients with asthma and cystic fibrosis.
• Inhaled Aspergillus fumigatus spores trigger an immune response, leading to chronic colonization and inflammation.

Purpose of the Study:

• To describe the pathogenesis, diagnosis, and histological findings of Allergic bronchopulmonary aspergillosis.
• To highlight the role of Aspergillus fumigatus in the development of ABPA.
• To discuss the potential of corticosteroid treatment in managing ABPA.

Main Methods:

• Review of clinical, serologic, and roentgenographic diagnostic criteria for ABPA.
• Analysis of histological findings from lung biopsies and resections in ABPA patients.
• Evaluation of the impact of corticosteroid therapy on disease progression.

Main Results:

• ABPA diagnosis typically relies on clinical, serologic, and imaging findings, often negating the need for lung biopsy.
• Histological examination can reveal diverse findings, including eosinophilic and mononuclear cell infiltration, mucoid impaction, eosinophilic pneumonia, bronchiolitis obliterans, granulomatous bronchiolitis, and pulmonary fibrosis.
• Corticosteroid treatment shows promise in preventing disease advancement.

Conclusions:

• ABPA results from a specific immune response to Aspergillus fumigatus in susceptible individuals.
• Histological findings in ABPA are varied and can evolve over time.
• Corticosteroids represent a key therapeutic strategy for managing ABPA and preventing its progression.