Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a 2 .6 cm linear metallic density only seen on the frontal view which projects over the expected site of the right pulmonary hilum . Possibility of foreign body is consider though this most likely represents external artifact and clinical correlation is advised . This finding is new from prior study dated ___ . Lungs appear clear though volumes are low . The heart size is within normal limits . The mediastinal contour is normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . No bony abnormalities .
    OUTPUT:
    
1 . Linear metallic density projecting over the right pulmonary hilum , new from prior exam , likely external artifact , less likely foreign body . 2 . Low lung volumes without definite sign of acute intrathoracic process .