Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . Lung volumes are low . Minimal patchy opacities are noted in the lung bases , likely atelectasis . No pleural effusion or pneumothorax identified . Pulmonary vasculature is normal . No acute osseous abnormalities detected .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .