Английская Википедия:High-attenuation crescent sign
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High attenuation crescent sign or hyperdense crescent sign is a radiologic sign indicating impending aortic rupture.[1][2] It is seen as a curvilinear area paralleling the vessel wall of the aorta.[3] The hyperdense area is due to intramural or mural thrombus haemorrhage. The blood that dissects through mural thrombosis or wall of the aneurysm causes weakening of the wall.[4] This is of relatively high density compared to the psoas muscle in contrast-enhanced CT and greater than the aorta in non-contrast CT imaging.[5]
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