Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is little change compared to a prior examination with re-demonstration of mildly enlarged cardiac silhouette . Hilar contours are unchanged . There is no large pleural effusion or pneumothorax . Increased prominence of the left heart border is likely due to ___ effect rather than pneumomediastinum and central mediastinum and superior mediastinum are unremarkable without evidence of free air or subcutaneous gas . The large cavitating left lower lobe mass previously described on CT is difficult to evaluate on this portable examination .
    OUTPUT:
    
Status post mediastinoscopy without evidence of complication .