Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is not enlarged . The cardiomediastinal silhouette is within normal limits . No CHF , focal infiltrate effusion or pneumothorax is detected . Visualized osseous structures are within normal limits . No radiopaque foreign body is detected . No free air seen beneath the diaphragms . Note is made of nonvisualization of the left clavicular companion shadow .
    OUTPUT:
    
No acute pulmonary process detected . Nonvisualization of the soft tissue contour adjacent to the superior edge of the left clavicle . While this could be artifact due to beam angulation , clinical correlation to exclude supraclavicular lymphadenopathy is requested .