Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show no focal parenchymal opacity to suggest pneumonia . No pleural effusion , pulmonary edema or pneumothorax is present . The pulmonary vasculature is not engorged . The cardiac silhouette is mildly enlarged , but stable . The mediastinal contours are prominent but unchanged , with unfolding of the thoracic aorta . The hilar contours are within normal limits . Mild separation of the uppermost three sternal wire sutures is unchanged and alignment is intact . Epicardial wires are still in place extending superficially and out of view on the lateral radiograph . No retrosternal collection or fragmentation of sternal wires is seen to suggest active infection .
    OUTPUT:
    
No acute cardiopulmonary process . Mild cardiomegaly stable since at least ___ .