Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacity at the right lung base is most suggestive of atelectasis versus scar . The lungs are otherwise clear . There is no pneumothorax or effusion . The cardiomediastinal silhouette is within normal limits . No visualized acute osseous abnormalities . Surgical clips identified in the right upper quadrant suggesting prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary process .