Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . There is widening of the left acromioclavicular joint which could reflect chronic AC joint separation .
    OUTPUT:
    
No acute intrathoracic process . Chronic left AC joint separation .