Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present which accentuates the size of cardiac silhouette which is borderline enlarged . The mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures but no pulmonary edema is present . Minimal atelectasis is seen at the lung bases . No pleural effusion or pneumothorax is seen . Bilateral fusion hardware spans the thoracolumbar spine .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .