Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . Cardiomediastinal silhouette including tortuosity of the thoracic aorta is stable . Lung volumes are low . Streaky bibasilar opacities likely represent atelectasis . Lungs are otherwise clear . There is no large effusion or pneumothorax .
    OUTPUT:
    
1 . Low lung volumes and mild bibasilar atelectasis . 2 . No displaced fractures ; however , conventional chest radiography is not sensitive for detection of rib fractures .