Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph , the patient has been intubated . The endotracheal tube terminates low in the distal trachea . A thoracic aortic stent is in place with no evidence of kinks or discontinuities . New retrocardiac airspace opacity is most likely due to atelectasis . There is no pneumothorax but minimal post - procedural pneumomediastinum . Cardiomegaly is unchanged . There is new moderate subcutaneous emphysema in the bilateral supraclavicular regions and left chest wall .
    OUTPUT:
    
Retrocardiac airspace opacity is most likely due to atelectasis . Stable cardiomegaly . New minimal post - procedural pneumomediastinum and moderate chest wall subcutaneous emphysema .