Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , the bibasal opacities and associated partially imaged effusion have not significantly changed . No interstitial edema . No pneumothorax . The heart is mildly enlarged . Postoperative mediastinum is unchanged in appearance with normal expected postoperative changes .
    OUTPUT:
    
No significant interval change in bibasal atelectasis .