Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart size remains moderately enlarged . The mediastinal contour is unremarkable and unchanged . Mild pulmonary vascular congestion is improved compared to the previous exam . Retrocardiac streaky opacity likely reflects atelectasis . Blunting of the right costophrenic sulcus suggests that there may be a trace pleural effusion . No pneumothorax is identified . Degenerative changes of the right glenohumeral joint with joint space narrowing and osteophytic spurring is present .
    OUTPUT:
    
Mild pulmonary vascular congestion and retrocardiac atelectasis .