Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is top normal in size . Mediastinal contour is normal . The lungs are grossly clear . There is minimal scarring at the left lung base . There is no evidence of pulmonary edema . There is no pneumothorax . Median sternotomy wires and mitral valve replacement are noted . There is a moderate hiatal hernia .
    OUTPUT:
    
No evidence of pulmonary edema .