Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size appears mildly enlarged , not substantially changed . The mediastinal and hilar contours are normal . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified . No displaced fractures are evident .
    OUTPUT:
    
Low lung volumes without acute cardiopulmonary process .