Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant interval improvement , with marked decrease in the bilateral airspace opacities predominantly in the upper lobes . There is persistent dense left retrocardiac opacity . No pneumothorax . No significant pleural effusions . The nasogastric tube has been removed .
    OUTPUT:
    
Significant interval improvement in the bilateral airspace opacities . Given the rapid improvement in the airspace opacities , noncardiogenic pulmonary edema is favored over diffuse pneumonia .