Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Bilateral perihilar and bibasilar opacities are identified . Mild blunting of the right lateral costophrenic angle could represent a pleural effusion . No definite left pleural effusion identified . Moderate cardiac enlargement , aortic valve prosthesis , and left chest wall dual lead pacing device are noted . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
Bibasilar opacities potentially due to combination of atelectasis or infection . Possible small right pleural effusion based on this portable exam . No large effusion .