Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Last lower lung linear densities most likely reflect atelectasis or scarring . No convincing evidence for pneumonia , edema , effusion , or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Left lower lung atelectasis versus scarring . No pneumonia .