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Insights into Imaging
Fig. 2 | Insights into Imaging

Fig. 2

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

Fig. 2

a Unenhanced axial CT shows a smooth central defect (white arrow) in the hyper-attenuating crescentic hematoma (black arrows) along the ascending thoracic aorta. b Enhanced CT shows a focal out-bulging (white arrow) of the aortic lumen, with smooth obtuse edges 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, d Unenhanced follow-up CT shows rupture of the ascending aorta (white arrow), hemopericardium (open arrows), and left pleural effusion

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