Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal , likely related to low lung volumes . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lung volumes however the lungs are clear . No pleural effusion or pneumothorax is seen . There is irregularity of the left AC joint , similar in appearance to ___ .
    OUTPUT:
    
No acute cardiopulmonary abnormality .