Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Relatively low lung volumes are seen . Retrocardiac opacity silhouetting the descending thoracic aorta may be due to atelectasis . The lungs otherwise appear grossly clear , where not obscured by overlying external monitoring devices . Left - sided chest tube is identified in similar position . The cardiomediastinal silhouette is within normal limits . Surgical clips seen in the right upper quadrant . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is detected .
    OUTPUT:
    
No significant interval change .