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Insights into Imaging
Fig. 4 | Insights into Imaging

Fig. 4

From: Broken-crescent sign at CT indicates impending aortic rupture in patients with acute aortic intramural hematoma

Fig. 4

a Unenhanced axial CT shows a smooth central defect (white arrow) in the hyper-attenuating crescentic hematoma (black arrows) along the ascending thoracic aorta and minimal hemopericardium. b Enhanced CT shows a smooth focal out-bulging (white arrow) of the aortic lumen corresponding to the defect on unenhanced study and non-enhancing crescentic hematoma (black arrows). Note the absence of intimal flap or contrast medium extravasation. c Surgical findings confirmed ecchymosis at the ascending aorta caused by IMH and focal aortic adventitial defect

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