Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low - normal . There is no focal consolidation , pleural effusion or pneumothorax . No central vascular congestion or overt pulmonary edema . Prominence of the bilateral pulmonary arteries may reflect pulmonary hypertension . Mild calcification at the aortic knob . Mediastinal and hilar contours are normal . Mild cardiomegaly is unchanged .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Stable mild cardiomegaly . 3 . Prominent central pulmonary arteries , which may potentially reflect underlying pulmonary hypertension .