Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film , vascular markings are slightly increased . Inspiratory volumes are lower . Again seen is platelike atelectasis at both lung bases , slightly more pronounced . Interval increase in the degree of retrocardiac opacity could reflect low lung volumes / atelectasis . Again noted is cardiomegaly , with prior sternotomy and TAVR . Compared with the prior study , there is a new single lead right - sided pacemaker with lead tip over the right ventricle . No pneumothorax detected .
    OUTPUT:
    
Interval placement of single lead pacemaker . The lead tip overlies the right ventricle . No pneumothorax detected . Inspiratory volumes are somewhat lower compared with ___ with slight increase in the degree of bibasilar atelectasis . Possible mild vascular plethora .