Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pleural effusion , pneumothorax or focal airspace consolidation . Heart is normal size . Mediastinal contours are unremarkable . Asymmetric opacity at the right heart border just inferior to the right pulmonary hilum is unchanged in overall appearance from CXR from ___ years ago and again has no correlate on the lateral view . This may reflect an area of scarring , or anomalous vasculature though underlying mass is difficult to exclude .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Asymmetric opacity at the right infrahilar / right heart border is grossly unchanged from prior chest radiograph . For definitive characterization , a nonemergent chest CT may be performed .