Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant cardiomegaly and a large , tortuous aorta without focal aneurysm are unchanged from prior study . Hilar contours are normal . A left pectoral pacer remains in place with appropriate lead positioning . Lungs are clear . There is a trace left pleural effusion . There is no pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of infection or edema .