Figure 14b. Multiple neurofibromas in a 9-year-old girl with neurofibromatosis. Contrast-enhanced axial CT scans at the thoracic inlet (a) and supraaortic level (b) show a well-defined mediastinal mass with bilateral, isoattenuating, nonenhancing masses displacing the supraaortic vessels anteriorly and extending along the borders of the lower ribs (arrows).