Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior radiograph , there is stable moderate cardiomegaly . Retrocardiac opacity is essentially unchanged from the prior study , and most likely represents atelectasis . There is no pulmonary edema or pleural effusions . No consolidation concerning for pneumonia . Sternal hardware is unchanged . Pacemaker wires are in standard position .
    OUTPUT:
    
No acute cardiopulmonary process .