Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged . The aorta is mildly tortuous and demonstrates calcifications at the aortic arch . The mediastinal and hilar contours are otherwise unchanged . There is no pulmonary vascular congestion . Minimal patchy opacities in the lung bases likely reflect atelectasis . There is no pleural effusion or pneumothorax . Marked degenerative changes with anterior osteophyte formation is again noted within the imaged thoracic spine .
    OUTPUT:
    
Minimal bibasilar atelectasis .