Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube 4 cm above the carina . Linear bibasilar atelectasis new . Bilateral low lung volumes . Previous bilateral pulmonary edema has improved . Mild cardiomegaly stable . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
ET tube 4 cm above the carina . Mild bibasilar atelectasis new . Substantial improvement in bilateral pulmonary edema compared to ___