Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacity at the left lung base is most suggestive of atelectasis , especially in setting of relatively low lung volumes . The lungs are otherwise clear . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary process .