Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are unremarkable . Pulmonary vascularity is normal . Minimal atelectasis is noted in the lung bases . No focal consolidation , pleural effusion or pneumothorax is seen . No acute osseous abnormalities are present .
    OUTPUT:
    
Minimal bibasilar atelectasis .