Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has had median sternotomy with valvuloplasty . Sternotomy wires are intact and aligned . The Swan - Ganz catheter has been removed , but the right IJ sheath remains in place . Bilateral chest tubes and mediastinal drains remain in place . The patient has been extubated , and a nasogastric tube has been removed . Lung volumes are low . Mild bilateral pulmonary edema has improved . There is new mild mediastinal widening which is likely due to vascular congestion , however attention on followup is advised . Left basilar atelectasis or infection is unchanged .
    OUTPUT:
    
Improved mild pulmonary edema . New mediastinal widening may be due to vascular congestion , however attention at followup is advised . No appreciable change in left basilar atelectasis or infection .