Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A small focus of opacity along the diaphragm near the right heart border likely represents atelectasis given the appearance of this region on CT . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is mildly enlarged .
    OUTPUT:
    
No acute cardiopulmonary process .