Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Right ventricular lead of a left chest wall pacer terminates in stable position . Moderate cardiomegaly is unchanged and mediastinal contours are stable . Pulmonary vascular markings are increased , suggesting mild pulmonary vascular congestion . Right base and retrocardiac opacities are increased and could represent atelectasis or infection . No pleural effusion or pneumothorax .
    OUTPUT:
    
Mild pulmonary vascular congestion with increased bibasilar opacities , either atelectasis or infection .