Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . Mediastinal and hilar contours are unchanged with mild atherosclerotic calcification noted diffusely within the thoracic aorta . The pulmonary vasculature is normal . Minimal patchy opacities within the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities demonstrated . L1 compression fracture is unchanged .
    OUTPUT:
    
Minimal bibasilar atelectasis .