Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is at the upper limits of normal , likely exaggerated by the low lung volumes . The mediastinal and hilar contours are normal . The lung volumes are low but clear of consolidation . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes , but no acute cardiopulmonary process .