Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are unchanged compared to the prior study . The cardiomediastinal contour is also unchanged with moderate cardiomegaly . The right hilum appears enlarged , likely reflecting pulmonary arterial hypertension . The central pulmonary vasculature is also prominent . No frank pulmonary edema however . No new airspace opacity seen . No definite pleural effusion or pneumothorax .
    OUTPUT:
    
No significant interval change when compared to the prior study .