Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes somewhat low , as before . There is streaky density in the left and at the right base consistent with subsegmental atelectasis or scarring . The heart appears enlarged . The patient is status post median sternotomy . Mediastinal structures are stable . A right internal jugular catheter remains in place . Allowing for differences in technique , there is no significant change .
    OUTPUT:
    
No significant change .