Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified , there no visualized displaced rib fractures on this nondedicated exam . Radiopaque density projects over the lower neck in the midline , potentially external .
    OUTPUT:
    
No acute cardiopulmonary process .