Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The heart is mildly enlarged , similar to prior . Calcification is again seen of the aortic knob . The pulmonary vasculature is unremarkable and there is no evidence of pulmonary edema . The lungs are clear without focal or diffuse abnormality . No pleural effusion or pneumothorax . Osseous structures are unremarkable . No radiopaque foreign bodies .
    OUTPUT:
    
Mild cardiomegaly . No acute cardiopulmonary process .