Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear lungs without effusion or pneumothorax . The cardiac silhouette is normal in size , the mediastinal contours are notable only for calcification of the aortic arch . A BB marker is situated over the right clavicular head , where no soft tissue or osseous abnormality is seen .
    OUTPUT:
    
1 . No acute chest abnormality . 2 . BB marker over the right clavicular head ; no definite radiographic abnormality is seen in this region . Findings were discussed with ___ , medical assistant to Dr . ___ at 4 : 10 p .m . by phone .