Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright AP radiograph of the chest demonstrates unchanged postoperative widening of the cardiac mediastinal silhouette . The patient is status post median sternotomy with intact appearing wires and multiple mediastinal surgical clips compatible with recent CABG . An aortic valve prosthesis is also noted . There is hazy opacification of the bilateral lung bases corresponding to moderate right and small left layering pleural effusions . Mild pulmonary vascular congestion and interstitial edema is unchanged . No pneumothorax detected .
    OUTPUT:
    
Stable postoperative appearance of the chest with moderate right and small left pleural effusions , basilar atelectasis and pulmonary vascular congestion .