Investigation of Nigerians with diffuse radiographic pulmonary shadowing

Area of Science:

• Pulmonology
• Radiology
• Pathology

Background:

• Tuberculosis is highly prevalent in developing countries, often leading to assumptions about diffuse pulmonary infiltrates.
• Investigating alternative causes of diffuse lung disease is crucial for accurate diagnosis and treatment.

Observation:

• A five-year study in Ibadan, Nigeria, examined 45 patients with diffuse pulmonary infiltration and negative sputum cultures for tuberculosis.
• Pulmonary function studies and lung biopsies were utilized to determine the underlying causes.

Findings:

• Cryptogenic fibrosing alveolitis was the most frequent diagnosis (13 cases).
• Malignant disease was the second most common (11 cases).
• Other identified causes included sarcoidosis, progressive systemic sclerosis, tuberculosis (miliary and non-caseating), and pulmonary alveolar microlithiasis, with the latter being the first reported case in Sub-Saharan Africa.

Implications:

• The study underscores that diffuse pulmonary infiltrates in developing nations may stem from diverse pathologies beyond tuberculosis.
• Accurate diagnosis requires comprehensive investigation, including advanced pulmonary diagnostics.
• This research expands the differential diagnosis for diffuse lung disease in high tuberculosis prevalence regions.