Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has been extubated . New left retrocardiac opacity likely atelectasis is associated with inferior displacement of the left hilum . There is also a new right retrocardiac opacity . Small bilateral effusions are also new .
    OUTPUT:
    
New left retrocardiac opacity is likely due to substantial left lower lobe atelectasis but coexisting pneumonia is possible in the appropriate clinical setting .