Abstract
The yin-yang sign is helpful in facilitating diagnosis of partially thrombosed true arterial aneurysms and false aneurysms. At contrast-enhanced CT, increased attenuation in one portion of the thrombosed aneurysm indicates the presence of a partially contrast material–filled lumen, whereas reduced attenuation in the remaining portion of the thrombosed aneurysm indicates the presence of a mural thrombus.
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