Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires appear intact and appropriately aligned . The patient is status post mitral valve replacement . Abdominal surgical clips are re-demonstrated . The moderate - sized left pleural effusion is essentially unchanged in size . The right lung is clear . The cardiomediastinal silhouette is stable . Multiple calcified mediastinal lymph nodes are again visualized . The pulmonary vasculature is normal . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Stable size of the moderate left pleural effusion .