Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are decreased . The cardiac silhouette is mildly enlarged . There are calcifications involving the aortic knob . The hilar and mediastinal contours are otherwise normal . There is no focal consolidation , large pleural effusion or pneumothorax . There is no overt pulmonary edema .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .