Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are extremely low , accentuating the cardiac silhouette and pulmonary vasculature . Given low lung volumes , heart size is likely top normal . Mediastinal silhouette and hilar contours are unremarkable . Lungs are clear without focal consolidation concerning for pneumonia . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Low lung volumes .