Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume and show bilateral interstitial and focal airspace opacities with a more confluent opacity in both lower lobes . The cardiac silhouette is enlarged . The mediastinal silhouette and hilar contours are grossly unremarkable . There may be small bilateral effusions . No pneumothorax is present .
    OUTPUT:
    
Mild to moderate pulmonary edema with bibasilar lower lobe opacities that could represent atelectasis or pneumonia .