Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes , which results in bronchovascular crowding . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax , pleural effusion , or consolidation . No acute displaced rib fractures identified .
    OUTPUT:
    
No acute cardiopulmonary process .