Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Minimal atelectasis is demonstrated in the lung bases , without focal consolidation . There is no pleural effusion or pneumothorax . No acute osseous abnormality is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Minimal bibasilar atelectasis .