Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . There is mild bronchial wall thickening . There is no focal airspace opacity to suggest pneumonia . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild bronchial wall thickening may reflect bronchitis . There is no evidence of pneumonia .