Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accounting for some bronchovascular crowding . Otherwise , there are no focal parenchymal opacities . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Probable moderate size hiatal hernia is present .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .