Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low compared to the previous exam which accentuates the size of the cardiac silhouette . Heart size is likely mildly enlarged . Mediastinal and hilar contours are unremarkable . There is mild crowding of the bronchovascular structures but no pulmonary edema is demonstrated . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are moderate degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes without acute cardiopulmonary abnormality .