Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since most recent prior radiographs , again seen are small bilateral pleural effusions . Prominence of interstitial markings and hyperexpansion may be consistent with emphysema ; however , mild pulmonary edema can not be excluded . Again seen is opacity overlying the left base as well as the left mid lung zone which is slightly more conspicuous on today 's exam . Known underlying left basilar nodular opacities are also partially visualized . This may represent infection or aspiration . Left chest wall pacemaker is seen with leads in the right atrium and right ventricle . Cardiomediastinal silhouette is unchanged . Bony structures are intact .
    OUTPUT:
    
1 . Unchanged small bilateral pleural effusions . 2 . Possible mild pulmonary edema on background of emphysema . 3 . Slight increase in left basilar opacity may indicate a superimposed infectious process .