Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Given differences in patient positioning , exam is largely unchanged with bilateral moderate pleural effusions , left greater than right with associated bibasilar atelectasis . No dense focal opacification concerning for pneumonia identified , though examination is limited by overlying effusions . Cardiomediastinal and hilar contours are unchanged .
    OUTPUT:
    
Unchanged exam with bilateral pleural effusions and adjacent opacification , likely atelectasis though can not definitively exclude pneumonia .