Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Midline sternotomy wires and mediastinal clips are again seen . There is chest wall emphysema which is not significantly changed from prior exam . There is bibasilar atelectasis without convincing sign of pneumonia or CHF . No effusion is seen . The cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
No signs of pneumonia . Bibasilar atelectasis stable , unchanged subcutaneous chest wall emphysema .