Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette with a left ventricular predominance is unchanged . The aorta remains tortuous , and the hilar contours are stable . Pulmonary vascularity is not engorged . There is minimal atelectasis within the lung bases , but no focal consolidation is present . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis .