Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . There is bibasilar atelectasis . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are unremarkable . No large pleural effusion is seen although trace pleural effusion is difficult to exclude . If pleural effusions are present , there decreased compared to the prior study .
    OUTPUT:
    
Is trace pleural effusions are present , there decrease in size compared to the prior study . Basilar atelectasis .