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 with leads terminating in the right atrium and right ventricle remain in unchanged positions . The heart size remains moderate to severely enlarged . The aorta is tortuous . The mediastinal and hilar contours are stable . There is no overt pulmonary edema , with mild pulmonary vascular congestion noted . Small bilateral pleural effusions are present with patchy retrocardiac opacity potentially reflecting atelectasis though infection can not be excluded . No pneumothorax is visualized . Degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and small bilateral pleural effusions . Retrocardiac opacity likely reflects atelectasis though infection is difficult to exclude in the correct clinical setting .