Legionnaires' disease. Postmortem pathologic findings of 20 cases

Area of Science:

• Pathology
• Infectious Diseases
• Pulmonary Medicine

Background:

• Legionnaires' disease is a severe pneumonia with significant mortality.
• Nosocomial acquisition poses a challenge in clinical and pathological diagnosis.

Purpose of the Study:

• To characterize the postmortem findings in patients with nosocomially acquired Legionnaires' disease.
• To correlate histological findings with clinical outcomes.

Main Methods:

• Postmortem examination of 20 patients with confirmed Legionnaires' disease.
• Histopathological and electron-microscopic analysis of lung tissue.
• Review of clinical data and cause of death.

Main Results:

• Consistent pulmonary findings included bronchopneumonia and lobar pneumonia.
• Characteristic acute findings: intra-alveolar exudation (macrophages, neutrophils, erythrocytes, fibrin), necrosis, and edema.
• Organized pneumonia observed in patients with resolved acute illness.
• Electron microscopy showed numerous bacilli within macrophages.

Conclusions:

• Pulmonary pathology is the hallmark of fatal Legionnaires' disease.
• Histopathology provides crucial diagnostic features, even after clinical resolution.
• The study elucidates the pathological spectrum of Legionnaires' disease.