Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Trace pneumoperitoneum is within postsurgical limits . Extensive pleural - based calcifications are seen bilaterally . The heart size is top normal . The hilar and mediastinal contours remain within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . Bibasilar linear opacities are compatible with atelectasis .
    OUTPUT:
    
Bibasilar atelectasis . No focal consolidation . Trace pneumoperitoneum within postsurgical limits .