Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Anterior mediastinal mass obscuring the aortic arch and AP window on the frontal view with prominence of the right lower mediastinal contour appears grossly unchanged . Hilar contours are similar . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Unchanged anterior mediastinal mass . No new focal consolidation to suggest pneumonia