Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest provided . Midline sternotomy wires and mediastinal clips are again noted . There is mild left basal atelectasis versus scarring , which appears stable . Lungs are otherwise clear . Cardiomediastinal silhouette is normal . Bony structures appear intact . No free air is seen below the right hemidiaphragm .
    OUTPUT:
    
No acute findings . Mild left basal atelectasis versus scarring .