Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . There is mild enlargement of cardiac silhouette which is unchanged . Mediastinal and hilar contours are unremarkable . Aortic knob calcifications are again seen . There is persistent upper zone vascular redistribution , compatible with chronic congestion , but no overt pulmonary edema . Linear opacity within the right lung base likely reflect subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present .
    OUTPUT:
    
Chornic mild pulmonary vascular congestion without overt pulmonary edema .