Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post CABG . Sternotomy wires are intact . A dual lead pacer terminates at the right atrium and right ventricle . A moderate pleural effusion is seen at the right lung base partially obscuring the right heart border . Posttreatment changes are seen at the right hilum . The left lung is clear . No p pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
There is development of a moderate pleural effusion at the right lung base .