Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright view of the chest . A right - sided pacemaker is unchanged in position . There is no free air . There are low lung volumes which crowd the pulmonary vasculature , though mild pulmonary vascular congestion may be present . There are bibasilar opacities , likely atelectasis . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . No free air . 2 . Low lung volumes result in crowding of the pulmonary vasculature , though mild pulmonary vascular congestion may be present . 3 . Bibasilar opacities , likely atelectasis .