Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , but there is no definite consolidation . Heart size is at the upper limits of normal . Hiatal hernia is noted . The aorta is tortuous and unfolded . No significant pleural effusions or pneumothorax . No displaced rib fractures are identified .
    OUTPUT:
    
No acute cardiopulmonary process . Low lung volumes .