Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post CABG . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . Small left pleural effusion . No pneumothorax . There are no acute osseous abnormalities .
    OUTPUT:
    
Small left pleural effusion .