Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is mildly enlarged but unchanged . The aorta is tortuous . Pulmonary vasculature is normal and the hilar contours are stable . Streaky linear opacities in both lung bases likely reflect areas of atelectasis . No pleural effusion , focal consolidation or pneumothorax is identified . No acute osseous abnormalities present . Scoliosis of the thoracic spine is again noted .
    OUTPUT:
    
Mild bibasilar atelectasis .