Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is normal . The lungs are clear . The hila and pleura are normal . No soft tissue injuries are seen . Aside from chronic degenerative changes no obvious osseous abnormalities are seen .
    OUTPUT:
    
No evidence of acute etiology to explain left upper chest wall / clavicle pain .