Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: All lines and tubes are appropriate and unchanged in positioning . There are increasing airspace opacities bilaterally , which may represent multifocal pneumonia . Mild interstitial pulmonary edema persists . There is stable enlargement of the cardiomediastinal silhouette . There are no large pleural effusions . There is no pneumothorax .
    OUTPUT:
    
1 . Appropriate positioning of all lines and tubes . 2 . Increasing bilateral airspace opacities , which likely represents multifocal pneumonia . 3 . Mild interstitial pulmonary edema .