Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . There are postsurgical changes in the left perihilar region and anterior mediastinum . There is additional streaky density in the lingula and left lung base consistent with subsegmental atelectasis and possibly a small area of consolidation in the posterior portion of the left lung base . In addition , the posterior costophrenic sulci are blunted . No pneumothorax is seen . The right lung is clear . Mediastinal structures are stable . The bony thorax appears intact .
    OUTPUT:
    
Postsurgical change in the mediastinum and the left perihilar region . Small area of density in the left lower lobe consistent with atelectasis or consolidation . Small pleural effusions .