Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low but stable . Mild - to - moderate cardiomegaly is stable . The mediastinal and hilar contours are normal . Chronic calcification of the aortic arch . The pleural surfaces are normal . Stable degenerative changes of the spine with stable chronic compression fracture of a lower thoracic vertebra . Stable erosive changes of bilateral shoulder joints .
    OUTPUT:
    
No acute cardiopulmonary process .