Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post coronary artery bypass graft surgery and placement of a single lead pacemaker whose tip terminates in the right ventricle . Heart is again mild to moderately enlarged . Central pulmonary arteries are probably enlarged and appear increased in size as best depicted on the lateral view . Mild fissural thickening suggests vascular congestion . Regional opacification in the right upper lung has resolved . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Very mild pulmonary vascular congestion and increased enlargement of central pulmonary arteries .