Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show bilateral interstitial and focal airspace opacities . A more confluent opacity is noted in the left lower lobe . The cardiac silhouette is enlarged . The mediastinal silhouette is widened . The hilar contours are normal . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
New left lower lobe opacity could represent atelectasis or pneumonia . Mild edema . A repeat chest radiograph is recommended after adequate treatment to document resolution .