Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is present . The mediastinal hilar contours are unremarkable . No pulmonary edema is present . Patchy opacities in the lung bases may reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Moderate degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .