Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Chronic changes centered at the distal left clavicle with widening of the acromioclavicular joint which is likely chronic .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . Chronic likely posttraumatic changes centered at the left acromioclavicular joint .