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]

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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