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Ascending thoracic aortic dissection which extends from the aortic root to at least the mid thoracic aorta. Stranding about the ascending aorta and aortic arch, raising concern for early rupture. Right coronary artery may arise from the false lumen. Left coronary artery arises from the true lumen with heavy calcifications. Bolus timing is early for the evaluation pulmonary embolus. No large or central pulmonary embolus is identified.