Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Possible mild hyperinflation with slight flattening of the diaphragms raising the possibility of mild background emphysema . The cardiomediastinal silhouette is unchanged , without cardiomegaly . No CHF focal infiltrate or effusion is detected . No free air seen beneath the diaphragm .
    OUTPUT:
    
Question background hyperinflation . No acute pulmonary process detected . No free air identified beneath the diaphragm .