Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the previous study which accentuates the size of the cardiac silhouette . Heart size appears mildly enlarged . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities identified .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary abnormality .