Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are low . Upper lobe lucency suggestive of emphysema . No convincing signs of pneumonia or CHF . Mild retrocardiac opacity may represent atelectasis . Cardiomediastinal silhouette is grossly unremarkable . No bony injuries .
    OUTPUT:
    
No acute findings .