Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Known mediastinal and hilar lymphadenopathy is not clearly appreciated on chest radiograph . There is mild bibasilar atelectasis ; otherwise , the lungs are clear with no evidence of consolidation , effusion , or pneumothorax . Atherosclerotic calcifications are again noted at the aortic arch . No acute fractures are identified . Chronically elevated right hemidiaphragm is noted .
    OUTPUT:
    
Mild bibasilar atelectasis . Known mediastinal and hilar lymphadenopathy is not clearly appreciated on today 's chest radiograph .