Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires intact and aligned . Prosthetic aortic valve intact . Stable , small right pleural effusion . Interval resolution of linear opacities at the left base reflects improved atelectasis . Normal cardiomediastinal and hilar contours . No acute pneumonia or pneumothorax .
    OUTPUT:
    
Stable , small right pleural effusion .