Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Post CABG changes are stable . The cardiomediastinal shadow is normal . No pulmonary edema . No pneumothorax . No airspace consolidation . Mild silhouetting of the left hemidiaphragm representing subsegmental atelectasis .
    OUTPUT:
    
No pulmonary edema . No airspace consolidation . Left basal subsegmental atelectasis .