Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The aorta is slightly tortuous . Mediastinal and hilar contours are otherwise unremarkable . There is no pulmonary edema . Minimal patchy bibasilar opacities likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .