Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate a moderate - sized left pleural effusion which is slightly increased since ___ ___ . No right pleural effusion is seen . There is atelectasis adjacent to the pleural effusion at the left base . Otherwise , the lungs are clear . The cardiac and mediastinal contours are unchanged since prior study . Intact median sternotomy wires are noted . No pneumothorax is seen .
    OUTPUT:
    
Moderate left pleural effusion which has increased since ___ ___ . No right pleural effusion .