Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube terminates approximately 3 cm above the carina . A nasogastric tube terminates in the stomach with side port beyond expected location of the gastroesophageal junction . Lung volumes are low with bibasilar atelectasis , slightly improved . Mediastinal contours and cardiac silhouette are unchanged . No pleural effusion or pneumothorax .
    OUTPUT:
    
Bibasilar atelectasis , slightly improved since ___ .