Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is a vague linear opacity in the left lower lung which is most compatible with atelectasis though the possibility of a very focal pneumonia is impossible to exclude . The cardiomediastinal silhouette is normal . No pleural effusion or pneumothorax . Bony structure is intact .
    OUTPUT:
    
Focus of linear opacity in the left lower lung is most compatible with atelectasis .