Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size remains mildly enlarged . Mediastinal and hilar contours are unchanged with calcification of the aortic knob is again noted . There is minimal bibasilar atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No pulmonary vascular congestion is visualized . Anterior osteophytes are noted within the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .