Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal opacity , pulmonary edema , pleural effusion or pneumothorax . Mild bronchial wall thickening . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
No pneumonia . Mild bronchial wall thickening could reflect chronic airway inflammation or acute bronchitis in the appropriate clinical setting .