Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild to moderate enlargement of the cardiac silhouette , unchanged . Mediastinal and hilar contours are stable . Pulmonary vascularity is normal . Streaky opacities in the lung bases are felt to reflect atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Mild bibasilar atelectasis .