Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacer device is noted with single lead terminating in the right ventricle . Moderate to severe cardiomegaly is re - demonstrated . The mediastinal contour is unchanged with re - demonstration of an elongated aorta . There is mild pulmonary vascular congestion . Streaky atelectasis is seen in both lung bases without focal consolidation . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormalities detected .
    OUTPUT:
    
Moderate to severe cardiomegaly , unchanged , and mild pulmonary vascular congestion .