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Year : 2021  |  Volume : 16  |  Issue : 1  |  Page : 222

The yin-yang sign: Footprint in diagnosis of pseudoaneurysm

Department of Radiodiagnosis, Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences (Deemed to be University), Wardha, Maharashtra, India

Date of Submission28-Apr-2020
Date of Decision20-Dec-2020
Date of Acceptance18-Jan-2021
Date of Web Publication29-Jul-2021

Correspondence Address:
Dr. Suresh Phatak
Department of Radiodiagnosis, Datta Meghe Institute of Medical Sciences, Sawangi (M) Wardha, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1319-4534.322602

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How to cite this article:
Deshpande S, Phatak S. The yin-yang sign: Footprint in diagnosis of pseudoaneurysm. J Datta Meghe Inst Med Sci Univ 2021;16:222

How to cite this URL:
Deshpande S, Phatak S. The yin-yang sign: Footprint in diagnosis of pseudoaneurysm. J Datta Meghe Inst Med Sci Univ [serial online] 2021 [cited 2021 Sep 16];16:222. Available from: http://www.journaldmims.com/text.asp?2021/16/1/222/322602


When there is a focal or diffuse dilatation of an artery to more than its 50% diameter, an aneurysm is formed. It can be of two types, true: Where all layers of the arterial wall are involved and false: Where all layers of the arterial wall are not involved. Most of these aneurysm grow rapidly and are asymptomatic, so their diagnosis plays a very vital role for further management. In false aneurysm (pseudoaneurysm), there are high chances of the development of thrombus and so filling by blood occurs only in a part of lesion[1] [Figure 1].
Figure 1: Gray scale ultrasound shows a hypoechoic lesion of size 36 mm × 20 mm with most of its lumen occupied by thrombus. Small partial lumen is visualized

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Pseudoaneurysm is diagnosed on Doppler ultrasound or computed tomography with the help of “the yin-yang sign.” This sign is an ancient Chinese symbol which is alluded in radiology for evaluation of aneurysmal vascular structures.[2] The yinyang sign is produced on color Doppler due to the presence of swirling and turbulent movement of bidirectional blood flow as red color is produced by the blood flowing toward transducer and blue color is produced by blood flowing away from the transducer. Thus, this sign on Doppler ultrasound helps in the swift diagnosis of pseudoaneurysm and avoid its further complication[3] [Figure 2].
Figure 2: Color Doppler showing classical yin yang sign (flow towards and away from the transducer in residual lumen in branch of external carotid artery)

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Conflicts of interest

There are no conflicts of interest.

  References Top

Lupattelli T. The yin-yang sign. Radiology 2006;238:1070-1.  Back to cited text no. 1
Pereira DJ, Gemery J, Sedlacek M. Learning from images. Open Urol Nephrol J 2015;8:88-9.  Back to cited text no. 2
Chun EJ. Ultrasonographic evaluation of complications related to transfemoral arterial procedures. Ultrasonography 2018;37:164-73.  Back to cited text no. 3


  [Figure 1], [Figure 2]


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