Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Partially evaluated thoracic spinal hardware is present . The patient is status post median sternotomy . The size of the cardiac silhouette is enlarged but unchanged . There is mild hilar congestion and pulmonary edema , decreased since the prior radiograph . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
Mild pulmonary edema .