Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube tip sits 4 .5 cm above the carina . Compared to the prior exam , there has been improvement in pulmonary edema . The heart size and mediastinal contours are stable . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Improved pulmonary edema .