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Figure 10a. Impending aneurysm rupture in a 57-year-old man with a known abdominal aortic aneurysm and increasing abdominal pain. Axial unenhanced (a) and axial contrast-enhanced (b) CT images depict an abdominal aortic aneurysm with a hyperattenuating crescent sign (arrow in a), which represents an acute hematoma within the aneurysm wall.
