Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right base atelectasis is seen without definite focal consolidation . There may be minimal pulmonary vascular congestion , improved since the prior study . The patient is status post median sternotomy and CABG . The cardiac and mediastinal silhouettes are stable . No pneumothorax is seen .
    OUTPUT:
    
No pneumothorax identified .