Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of cardiac silhouette is unchanged . The mediastinal and hilar contours are also stable , with prominence of the main pulmonary artery indicative of pulmonary arterial hypertension . Perihilar hazy opacification which is more pronounced on the right likely reflects mild asymmetric pulmonary edema , similar to that seen on the previous exam . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities are demonstrated .
    OUTPUT:
    
Mild asymmetric pulmonary edema , similar to that seen on the previous exam .