Figure 2.

12-year-old male with Rosai-Dorfman disease. Axial chest CT obtained following the intravenous administration of 100 ml of Omnipaque 350. The CT setting was 100 kVp with modulated mAs. The image reveals a cardiac mass originating from the interatrial septum and abutting the atrioventricular groove (blue arrows). There is soft tissue density encasing the descending aorta (red arrow). There is left lower lobe atelectasis (green arrow) due to compression of the left lower lobe bronchus by the mass.