Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright view of the chest provided . Bibasilar atelectasis are larger on the left side There is no pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen . Aortic arch calcifications are seen .
    OUTPUT:
    
No acute intrathoracic process .