Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size remains mildly enlarged . Mediastinal and hilar contours are similar . No pulmonary edema is demonstrated . Streaky opacities are seen within the left lower lobe which could reflect atelectasis though infection or aspiration is not excluded . Trace bilateral pleural effusions are demonstrated . No acute osseous abnormality is detected .
    OUTPUT:
    
Small bilateral pleural effusions with left patchy opacity , potentially atelectasis though infection or aspiration can not be excluded .