Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided , demonstrating hyperinflated lungs with subtle upper lobe lucency , which could reflect underlying emphysema . No definite signs of pneumonia or CHF . No effusion or pneumothorax . Cardiomediastinal silhouette is normal . Two discrete tiny nodular densities projecting over the left perihilar region likely represent en face vessels . Bony structures are intact . A focal eventration of the left hemidiaphragm is seen on the lateral view posteriorly at the left lung base .
    OUTPUT:
    
Probable COPD without superimposed pneumonia .