Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lungs are somewhat hyperinflated with upper lobe lucency suggesting underlying emphysema . Subtle scattered micronodular opacities are noted in the mid to lower lungs , of unclear etiology . Please correlate with prior imaging studies if available . Nonemergent chest CT may be performed to further assess . No convincing signs of pneumonia or CHF . Cardiomediastinal silhouette is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Subtle micronodular opacities in the mid to lower lungs , of unclear etiology . Comparison with prior imaging and / or nonemergent chest CT recommended to further assess .