Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrate diffuse bilateral interstitial lung markings likely reflective of mild pulmonary edema . Obscuration of the right heart border likely reflects atelectatic changes , although early consolidation can not be excluded . Elevation of the left hemidiaphragm is noted with atelectatic changes at the left lung base . No large pleural effusion is identified . Patient is status post median sternotomy . Prominence of the mediastinum likely reflects dilated or tortuous aorta . Large gastric air bubble is seen .
    OUTPUT:
    
Mild pulmonary edema and atelectatic changes . Obscuration of the right heart border maybe due to atelectasis , though early pneumonia can not entirely be excluded .