Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Left - sided pacemaker device is noted with leads terminating in the right atrium , right ventricle , and region of the coronary sinus . Heart size remains mild to moderately enlarged . The aorta remains tortuous . Hilar contours are unchanged . Moderate size right pleural effusion is re - demonstrated with a laterally loculated component , not substantially changed in the interval . No overt pulmonary edema is demonstrated . Right basilar opacity could reflect compressive atelectasis though infection can not be completely excluded . Left lung is grossly clear . No pneumothorax is identified .
    OUTPUT:
    
Relatively unchanged appearance of moderate size right pleural effusion , a component of which appears to be loculated laterally . Right basilar opacity could reflect compressive atelectasis though infection is difficult to exclude .