Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is unchanged . The aorta remains tortuous . The mediastinal hilar contours are normal . The pulmonary vasculature is not engorged . There is minimal blunting of the costophrenic angles bilaterally suggestive of trace pleural effusions , unchanged . No pneumothorax is present . Clips from prior cholecystectomy are noted in the right upper quadrant of the abdomen .
    OUTPUT:
    
Unchanged trace bilateral pleural effusions . Otherwise , no acute cardiopulmonary process .