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Figure 4 One example of the development of typical aortic dissection in a patient with proximal aortic intramural hematoma (case no. 2). Initially, computed tomography showed dramatic decrease of aortic wall thickening with progressive enlargement of the lumen of the ascending aorta (October 31 and November 12). About two months after the event, she complained of chest pain again and follow-up study revealed development of typical aortic dissection.