Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The heart appears likely at the upper limits of normal size although not optimally assessed . The mediastinal contours are unremarkable . There is a confluent right infrahilar opacity in the right lower lung with Kerley B lines and blunting of the right cardiophrenic angle , quite asymmetric . Patchy retrocardiac opacity is less specific but an additional focus of pneumonia could be considered versus atelectasis . There is mild background perihilar fullness suggesting pulmonary venous hypertension or slight fluid overload , but not substantial . Each costophrenic sulcus is blunted which may suggest pleural effusions .
    OUTPUT:
    
Extensive right infrahilar opacity worrisome for pneumonia . Follow - up radiographs are recommended to show resolution . Patchy retrocardiac opacity , possibly atelectasis or pneumonia . Findings also suggestive of mild vascular congestion or fluid overload .