Thoracic aortic dissection
20 year-old with acute chest pain. No past medical history.
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Dilatation of the descending aorta, commencing at the level of the arch.
A dissection flap is evident with a 'tennis ball' type appearance of the smaller true and larger false lumen.
Retro-oesophageal origin of the right subclavian artery, with its origin at the same level on the arch as the dissection.