Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate no significant interval change since prior . Small right pleural effusion persists . There is no left - sided effusion . Minimal bibasilar atelectasis is unchanged . Cardiomediastinal silhouette , including a bulging contour of the right upper mediastinum is stable . There is no pneumothorax . Aortic core valve has normal postoperative appearance .
    OUTPUT:
    
No significant interval change . Stable small right pleural effusion .