Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrate low lung volumes . Cardiomediastinal and hilar contours are stable relative to prior examination dated ___ . No evidence of pulmonary edema , pleural effusion , or pneumothorax . Imaged osseous structures demonstrates bilateral acromioclavicular joint degenerative changes , left greater than right . Imaged upper abdomen is without an acute abnormality .
    OUTPUT:
    
No acute cardiopulmonary process .