Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The tip of the endotracheal tube projects 3 cm above the carina . Course of the nasogastric tube is unremarkable , the tip is not displayed on the image . Moderate atelectasis in the retrocardiac lung regions .
    OUTPUT:
    
No evidence of larger pleural effusions or pneumonia . No pulmonary edema . No pneumothorax .