Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . There is a left basilar opacity which may reflect pleural fluid or atelectasis . However , an infectious process can not be excluded . There is no definite pneumothorax . A left - sided pacemaker is seen with its leads projecting over the right atrium and right ventricle , expected locations .
    OUTPUT:
    
Left basilar opacity may reflect pleural fluid or atelectasis . However , an infectious process can not be excluded . PA and lateral chest radiographs would be helpful for further evaluation , if patient can tolerate it .