Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is mildly enlarged with a left ventricular predominance . The mediastinal and hilar contours are normal . Apart from minimal atelectasis at the lung bases , remainder of the lungs are clear . No pleural effusion or pneumothorax is seen . There is no pulmonary vascular congestion . No subdiaphragmatic free air is demonstrated .
    OUTPUT:
    
Mild bibasilar atelectasis . No subdiaphragmatic free air .