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High-attenuation crescent sign

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Radiologic sign

High attenuation crescent sign or hyperdense crescent sign is a radiologic sign indicating impending aortic rupture. It is seen as a curvilinear area paralleling the vessel wall of the aorta. 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. 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.

References

  1. Lee, Chris; Lynch, Richard (1 July 2015). "High-attenuation crescent sign on computed tomography in acute abdominal aortic aneurysm". The American Journal of Emergency Medicine. 33 (7): 988.e1. doi:10.1016/j.ajem.2014.12.038. ISSN 0735-6757. PMID 25724078. Retrieved 8 September 2021.
  2. Pang, Wenjing; Karol, Anne; Minault, Quentin; Veillon, Francis; Venkatasamy, Aina (1 January 2019). "The hyperdense crescent sign". Abdominal Radiology. 44 (1): 376–378. doi:10.1007/s00261-018-1697-7. ISSN 2366-0058. PMID 29987399. S2CID 49667107. Retrieved 8 September 2021.
  3. Gonsalves, Carin F. (1 April 1999). "The Hyperattenuating Crescent Sign". Radiology. 211 (1): 37–38. doi:10.1148/radiology.211.1.r99ap1137. ISSN 0033-8419. PMID 10189451. Retrieved 8 September 2021.
  4. Iranpour, Pooya; Haseli, Sara (4 June 2018). "Crescent sign in abdominal aortic aneurysm". BMJ Case Reports. 2018: bcr2018225435. doi:10.1136/bcr-2018-225435. ISSN 1757-790X. PMC 5990055. PMID 29866697.
  5. Iranpour, Pooya; Haseli, Sara (31 May 2018). "Crescent sign in abdominal aortic aneurysm". Case Reports. 2018: bcr. doi:10.1136/bcr-2018-225435. ISSN 1757-790X. PMC 5990055. PMID 29866697. Retrieved 8 September 2021.
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