Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single - lead pacemaker terminates in the right ventricle . The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There are substantial probably moderate and possibly large bilateral pleural effusions with associated basilar opacification , probably due to atelectasis and more dense and confluent on the left than right . Aerated lung parenchyma shows interstitial changes suggesting mild - to - moderate pulmonary edema . There is no pneumothorax .
    OUTPUT:
    
Findings suggesting congestive heart failure with substantial pleural effusions and basilar opacities , most likely due to atelectasis , although not completely specific .