Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . There is mild pulmonary edema , and small bilateral pleural effusions , the latter of which appear minimally increased compared to the prior exam . Consolidative opacity in the retrocardiac region likely reflects compressive atelectasis though infection is difficult to exclude . No pneumothorax is identified .
    OUTPUT:
    
Mild congestive heart failure with mild pulmonary edema and small bilateral pleural effusions , slightly increased from the prior exam . Left basilar opacity likely reflects atelectasis , but infection can not be excluded .