Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD / pacemaker device is re - demonstrated with leads terminating in the right atrium , right ventricle , and region of the coronary sinus . Heart size is mildly enlarged but unchanged . The mediastinal contours are unremarkable with minimal atherosclerotic calcifications of the aortic knob . There is mild pulmonary vascular congestion , but this is improved compared to the previous study . No focal consolidation , pleural effusion or pneumothorax is seen . Diffuse degenerative changes are again noted in the thoracic spine with anterior osteophyte formation .
    OUTPUT:
    
Mild pulmonary vascular congestion , improved compared to the prior study .