Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is unchanged . The hilar and mediastinal contours are stable with mild stable prominence of the main pulmonary artery , likely secondary to pulmonary arterial hypertension . No evidence of pneumonia . There has been interval improvement of the previously noted pulmonary edema with mild residual edema . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Mild residual pulmonary edema .