Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . Lung volumes are relatively low . Bronchial wall thickening is present in the perihilar and basilar regions , but there are no localizing areas of consolidation . Additionally , linear opacities are present in both lung bases . There are no pleural effusions or pneumothoraces .
    OUTPUT:
    
1 . Bronchial wall thickening , which may be related to history of acute bronchitis . No consolidation to suggest coexisting pneumonia . 2 . Bibasilar linear atelectasis or scarring .