Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of an endotracheal tube , which terminates just distal to the clavicles . The patient has had median sternotomy with CABG . A left pectoral AICD remains in place . A newly placed Swan - Ganz catheter terminates in the right descending pulmonary artery . Retained pacer leads are in place . There is no pneumothorax . Marked cardiomegaly is unchanged . Bilateral airspace opacities are slightly improved . New retrocardiac airspace opacification is likely due to atelectasis . Extensive splenic artery calcifications are incidentally noted .
    OUTPUT:
    
New retrocardiac airspace opacity is most likely due to atelectasis . Mild pulmonary edema is minimally improved .