Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates multiple intact sternal wires , mediastinal clips , and a central line terminating in the upper right atrium . Heart size remains severely enlarged . Retrocardiac opacity is persistent but improved compared to chest radiograph from the day prior . Previously seen mild pulmonary edema is improved as well . There is no focal consolidation or appreciable pleural effusion or pneumothorax .
    OUTPUT:
    
Pulmonary edema resolved . No appreciable atelectasis , pleural effusion , or evidence of pneumothorax . Stable normal postoperative cardiomediastinal silhouette .