Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single lead cardiac pacemaker . There is a marked cardiomegaly , with markedly enlarged right heart , stable since prior exam . Aortic calcification . Lungs are clear . Thoracolumbar curve . Normal pulmonary vascularity . No pleural effusion .
    OUTPUT:
    
Marked cardiomegaly , stable . Lungs are clear