Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is mild perihilar bronchial wall thickening . No focal consolidation . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Mild perihilar bronchial wall thickening could represent acute or chronic airways disease . No evidence of pneumonia .