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There is mild fusiform dilatation of the descending thoracic aorta just distal to the ligamentum arteriosum measuring approximately 4 cm in diameter. The aortic wall has a smooth contour with no atheromatous plaque, penetrating ulcer or dissection flap. No mediastinal haematoma.
Case courtesy Dr Elaine Lui, The Royal Melbourne Hospital.
The appearance of the proximal descending aorta reflects an "aortic spindle" - this is an anatomical variant where there is a smooth, mild "bulge" just beyond the aortic isthmus.