Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single - lead pacemaker device terminates in the right ventricle . There is mild unfolding of the thoracic aorta . The heart is moderately enlarged . Indistinct enlargement of each hilum is most consistent with mild vascular congestion but similar to the prior study . There is no pleural effusion or pneumothorax . The chest appears somewhat hyperinflated . Bony structures are unremarkable .
    OUTPUT:
    
Stable cardiomegaly and mild vascular congestion , but no definite evidence of acute superimposed disease .