Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . Mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . There is some mild prominence of upper zone pulmonary vessels suggesting slight fluid overload or pulmonary venous hypertension . These findings are less prominent than on the prior examination , however . Otherwise , the lungs appear clear . The bony structures were unremarkable .
    OUTPUT:
    
Mild pulmonary vascular prominence , but similar to baseline .