Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are relatively low , however the lungs remain clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . Widening of the right acromioclavicular joint is new since prior and could be postsurgical or posttraumatic in nature .
    OUTPUT:
    
No acute cardiopulmonary process .