Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette has enlarged since the prior study . The lungs are clear , without consolidation , pulmonary edema , pleural effusion or pneumothorax . Multiple mediastinal surgical clips and intact sternotomy wires relate to prior CABG .
    OUTPUT:
    
Mild enlargement of the cardiac silhouette , may be due to a pericardial effusion . Findings discussed with Dr .___ at 4 :20 p .m on ___ .