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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 image reveals a soft tissue mass encasing the descending aorta (red arrows). The mass extend to the level of the upper abdomen. Note the mottled appearance of the liver.
