Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 views were obtained of the chest . The lungs are somewhat low in volume with linear bibasilar atelectasis . Trace blunting of the costophrenic sulci on the lateral view could reflect pleural effusion or chronic pleural thickening . The heart is top normal in size with postsurgical changes from aortic valve replacement and CABG noted . Aorta remains tortuous .
    OUTPUT:
    
Mild bibasilar atelectasis and trace bilateral pleural effusions vs . chronic pleural thickening .