Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One AP portable upright view of the chest . No pneumothorax . No pleural effusions . The cardiac , mediastinal , and hilar contours are normal . Low lung volumes and mild bibasilar atelectasis . Spinal hardware is in appropriate position . No evidence of pneumonia .
    OUTPUT:
    
1 . No pneumothorax . 2 . Low lung volumes and mild bibasilar atelectasis .