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Click 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 images reveal a mass encasing the aortic root. There is left lower lobe atelectasis secondary to compression of the left lower lobe bronchus. The mass is noted to encircle the ascending and the descending aorta and to compress the esophagus. The mass extends to the level of the upper abdomen. Note the mottled appearance of the liver.

Click 12-year-old male with Rosai-Dorfman disease. Coronal chest CT obtained following the intravenous administration of 100 ml of Omnipaque 350. The CT setting was 100 kVp with modulated mAs. The images reveal a mass encasing the aortic root. There is left lower lobe atelectasis secondary to compression of the left lower lobe bronchus. The mass is noted to encircle the ascending and the descending aorta and to compress the esophagus. The mass extends to the level of the upper abdomen. Note the mottled appearance of the liver.

Click 12-year-old male with Rosai-Dorfman disease. Sagittal chest CT obtained following the intravenous administration of 100 ml of Omnipaque 350. The CT setting was 100 kVp with modulated mAs. The images reveal a mass encasing the aortic root. There is left lower lobe atelectasis secondary to compression of the left lower lobe bronchus. The mass is noted to encircle the ascending and the descending aorta and to compress the esophagus. The mass extends to the level of the upper abdomen. Note the mottled appearance of the liver.

Click 12-year-old male with Rosai-Dorfman disease. Axial views of a PET/CT obtained following the intravenous administration of 8.7 mCi of F-18-FDG. The enhanced CT portion of the study was obtained following the intravenous administration of 100 ml of Omnipaque 350. The CT setting was 100 kVp with modulated mAs. There is intense hypermetabolism in an interatrial mass that surrounds the aortic arch, the ascending and the descending aorta. The maximal SUV measured in the mass was 9.8, significantly higher than the blood pool activity.