Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . Subtle right base opacity and left upper lung opacity have improved compared the prior study . No definite new focal consolidation is seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . Severe compression deformity at the lower thoracic spine is re - demonstrated .
    OUTPUT:
    
Left upper lung opacity has significantly improved since the prior study . Subtle right base opacity has improved , but persists .