Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal contours are enlarged , likely accounted for by change in patient positioning . Median sternotomy wires are in unchanged position . There is apparent increase in bilateral pleural effusions , which is likely due to the upright position on the current exam . There is no pneumothorax or focal consolidation concerning for pneumonia . There is no pulmonary edema .
    OUTPUT:
    
Stable small bilateral pleural effusions .