Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a vague asymmetric opacity projecting over the left lung base best appreciated on the frontal view which in the correct clinical setting could represent a very early pneumonia versus atelectasis . No large effusion or pneumothorax . No signs of edema or congestion . Cardiomediastinal silhouette is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Subtle vague opacity at the left lung base could represent a very early pneumonia in the correct clinical setting .