Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly has been stable compared to multiple prior exams dating back to ___ . The hilar and mediastinal contours are unremarkable . Small bilateral pleural effusions are persistent . There is mild bibasilar atelectasis . There is no evidence of a pneumothorax .
    OUTPUT:
    
Mild bibasilar atelectasis . No evidence of pneumothorax .