Radiologic findings in farmer's lung. Prognosis and correlation to lung function

Area of Science:

• Pulmonary Medicine
• Radiology
• Occupational Health

Background:

• Farmer's lung (FL) is a hypersensitivity pneumonitis caused by moldy hay exposure.
• Radiographic findings are crucial for diagnosing and assessing the severity of FL.

Purpose of the Study:

• To classify radiologic findings in acute or subacute farmer's lung disease.
• To correlate initial radiologic changes with pulmonary function and long-term outcomes.

Main Methods:

• Chest X-ray findings of 93 patients with FL were classified by type and severity.
• Patients were followed for an average of 23 months, with pulmonary function tests (diffusing capacity) performed.
• Correlation between radiologic severity, pulmonary function, and development of chronic changes was analyzed.

Main Results:

• 78/93 patients had acute radiologic changes (nodular, ground-glass, striated opacities); 11 had chronic changes; 4 had normal X-rays initially.
• More severe initial radiologic changes correlated with more impaired diffusing capacity (Dsb).
• Severe changes resolved slower; severe appearance and striated opacities predisposed to chronic changes. Corticosteroids hastened diffuse opacity resolution but didn't alter overall lung function outcome.

Conclusions:

• Radiologic severity in farmer's lung disease is linked to initial lung function impairment and slower recovery.
• Specific acute findings like striated opacities predict the development of chronic fibrotic changes.
• While corticosteroids may aid in resolving acute opacities, they do not significantly alter the long-term lung function or the progression to chronic disease.