Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no evidence of pneumonia , pneumothorax , or pleural effusion . Cardiac silhouette is normal in size . There is no free air . The left AC joint is widened to 13 mm suggestive of previous AC joint separation , type II .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Widened left AC joint indicative of prior AC joint separation , type II .