Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . The aortic stent graft in a tortuous aorta is again seen . Patient is status post sternotomy . In the interval since the prior study , there has been interval increase in bibasilar opacities , right greater than left , worrisome for pneumonia . However , findings could also relate to aspiration . There are likely small bilateral pleural effusions . The cardiac silhouette remains enlarged . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Interval increase in right basilar opacity and to a lesser extent , left basilar opacity could be due to infection and / or aspiration . Small bilateral pleural effusions .