Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of cardiac silhouette is present . The aorta is diffusely calcified and tortuous . The pulmonary vasculature is not engorged . Patchy opacities in lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Moderate degenerative changes are noted in the thoracic spine . Bilateral remote posterior rib fractures are noted .
    OUTPUT:
    
Patchy atelectasis in the lung bases .