Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accentuating the cardiac silhouette and pulmonary vasculature . Cardiomediastinal silhouette and hilar contours are unremarkable . Lungs are clear with exception of left base atelectasis . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .