Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Linear opacity at the left lung base is most suggestive of atelectasis , it is only seen on the frontal view . The lungs are otherwise clear . The cardiomediastinal silhouette is normal . No acute osseous abnormality is identified . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary process .