Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Minimal linear opacity at the left lung base is most compatible with atelectasis , though a very subtle consolidation can not be entirely excluded . Remainder of the lungs appear clear . No large effusion or pneumothorax . The cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
Very subtle opacity at the left lung base could in the correct clinical setting represent an early pneumonia or aspiration .