Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided tunnel catheter terminates at the lower SVC , unchanged in position . The patient is post CABG . The heart size and hilar mediastinal contours remain unchanged since ___ . Again seen is some central pulmonary vascular congestion with mild edema , overall stable . Small bilateral pleural effusions appear improved . There is no pneumothorax .
    OUTPUT:
    
Central pulmonary vascular congestion with mild edema . Improved small bilateral pleural effusions .