Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Elevation of the right hemidiaphragm is unchanged . Posterior atelectasis at the left hemidiaphragm . Lung volumes are low accentuating the cardiac silhouette and pulmonary vasculature . Left dual lead pacer is unchanged . Heart size is top normal . Cardiomediastinal silhouette and hilar contours are normal . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .