Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has had interval median sternotomy with aortic valve replacement . Sternotomy wires are intact and aligned . ET tube terminates at the level the clavicles . The Swan - Ganz catheter projects over the main pulmonary artery . A nasogastric tube terminates in the stomach . Mediastinal drains and a left chest tube are in place . There is no pneumothorax . Lung volumes are low . New perihilar interstitial opacities are most likely due to gravitational pulmonary edema . Increased retrocardiac opacification at the left base is most likely due to atelectasis . The heart and mediastinum are within normal limits despite the projection .
    OUTPUT:
    
Status post aortic valve replacement with expected postoperative findings , including mild pulmonary edema and mild left basilar subsegmental atelectasis .