Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . The lungs are clear without focal consolidation . There is slight blunting of the posterior left costophrenic angle which may be due to a trace pleural effusion . No pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Possible trace left pleural effusion . No focal consolidation or pulmonary edema .