Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are small bilateral pleural effusions which have slightly decreased since ___ . No pulmonary edema or pneumothorax . Stable postoperative appearance of cardiomediastinal silhouette . Median sternotomy wires are intact .
    OUTPUT:
    
Interval decrease in size of small bilateral pleural effusions . No acute cardiopulmonary process .