Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . The lungs are clear without focal consolidation , effusion or pneumothorax . The heart is top - normal in size . The mediastinal contour appears normal . On the lateral view , there is a contour abnormality involving the sternum which raises potential concern for a fracture . No evidence of pneumomediastinum . No free air below the right hemidiaphragm . No displaced rib fractures are seen .
    OUTPUT:
    
1 . Possible sternal fracture . 2 . Top normal heart size .