Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP view of the chest provided . Median sternotomy wires are intact and proper alignment . Two prosthetic cardiac valves are unchanged . Bilateral , predominantly bibasilar alveolar opacities are unchanged from ___ . Focal opacification adjacent to the right heart border may represent atelectasis or pneumonia No pleural effusion or pneumothorax . Hilar and cardiomediastinal contours are stable .
    OUTPUT:
    
1 . Cardiomediastinal contours are enlarged , but stable from ___ . 2 . Focal opacification adjacent to the right heart border may represent atelectasis or pneumonia in the appropriate clinical setting . 3 . Bilateral , prominent bibasilar alveolar opacities are unchanged from ___ . These likely represent a combination of pulmonary edema and atelectasis , however in the appropriate clinical setting underlying pneumonia can not be excluded .