Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study is slightly limited positioning Mild to moderate enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours are similar with atherosclerotic calcifications noted at the aortic knob . The pulmonary vasculature is not engorged . Streaky opacities the lung bases may reflect areas of atelectasis . Small bilateral pleural effusions are present , perhaps increased from the previous study . No pneumothorax . No acute osseous abnormalities detected .
    OUTPUT:
    
Mild bibasilar atelectasis and small bilateral pleural effusions