Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is stable when compared to ___ study with a postoperative median sternotomy and CABG appearance and moderate cardiomegaly . Mild bibasilar atelectasis is unchanged as well as a small left pleural effusion .
    OUTPUT:
    
Stable bibasilar atelectasis and small left pleural effusion .