Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient remains intubated , the position of the monitoring and support devices is unchanged . The lung volumes remain low . Mild interval improvement of the retrocardiac opacity , likely reflecting the clinically suspected pneumonia / atelectasis . No pleural effusions . No pneumothorax .
    OUTPUT:
    
Mild interval improvement of the left retrocardiac opacity .