Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are low and there is crowding of the bronchovascular structures . Linear opacities in the perihilar regions and bilateral lower lobes are compatible with bibasilar atelectasis versus scarring . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette is stable from ___ . There is no free air underneath the hemidiaphragms . There is no acute osseous abnormality .
    OUTPUT:
    
1 . No pneumothorax . 2 . Linear atelectasis versus scarring .