Bronchiolitis obliterans caused by Legionella pneumophila

Area of Science:

• Pulmonology
• Infectious Diseases
• Pathology

Background:

• Atypical pneumonia presents diagnostic challenges, particularly in immunocompromised patients.
• Diabetic patients are susceptible to various infections, including atypical pneumonia.
• Early diagnosis and targeted treatment are crucial for managing severe respiratory infections.

Observation:

• A diabetic patient presented with worsening dyspnea, hypoxemia, and radiographic evidence of pneumonia unresponsive to antibiotics.
• Open lung biopsy revealed bronchiolitis obliterans, a non-specific finding.
• Diagnostic investigation included serological testing for Legionnaires' disease.

Findings:

• Legionnaires' disease was confirmed by a fourfold rise in indirect fluorescent antibody titer.
• The case demonstrates Legionella pneumophila can cause lung injury manifesting as bronchiolitis obliterans.
• Histopathological findings of bronchiolitis obliterans in this context are significant.

Implications:

• Legionnaires' disease should be considered in patients with atypical pneumonia and risk factors.
• Bronchiolitis obliterans may be a manifestation of Legionella-induced lung injury.
• Corticosteroid therapy may offer a beneficial treatment option for such cases.