Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upper lung hyperlucency is consistent with emphysema . Mediastinal and cardiac contours are normal . There is no pneumothorax or pleural effusion . Small apical subpleural opacity is more prominent on the left side .
    OUTPUT:
    
Apical subpleural opacity could be scarring but is asymmetric on the left side . If Horner is on the left side , a CT scan should be considered .