Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , accentuating the heart size , which is persistently mildly enlarged . There is mild pulmonary vascular congestion . The right subclavian vein stent is in place . There is no pleural effusion , pneumothorax , or focal consolidation worrisome for pneumonia . No evidence of subdiaphragmatic free air .
    OUTPUT:
    
Mild pulmonary vascular congestion and stable mild cardiomegaly . No subdiaphragmatic free air .