Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild hyperexpansion suggests emphysema . Faint airspace opacity in the posterior costophrenic sulcus may represent very early pneumonia or atelectasis depending on the clinical setting . There is no pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is normal . Right hemidiaphragm eventration is incidentally noted .
    OUTPUT:
    
1 . Faint posterior costophrenic sulcus of airspace opacity may represent very early pneumonia or atelectasis depending on the clinical setting . No other acute cardiopulmonary process . 2 . Hyperexpansion suggesting emphysema .