Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires are intact . No interval change in cardiomediastinal silhouette which is mildly enlarged . The lungs are clear with possible small pleural effusions , side indeterminate . No pneumothorax , pneumomediastinum or pneumoperitoneum . Mediastinal and hilar contours are normal . Opacity in the right main stem bronchus can be retrospectively seen dating back to at least ___ and may represent possible mucous impaction in the right main stem bronchus .
    OUTPUT:
    
1 . No pneumomediastinum , pneumoperitoneum or pneumothorax is identified . 2 . Possible mucous impaction in the right main stem bronchus . Please correlate clinically .