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. 2020 Aug 26;11:98. doi: 10.1186/s13244-020-00903-5

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Fig. 17 — Duplex ultrasound image demonstrating a left groin pseudoaneurysm due to injected drug use. Yin-yang sign indicating turbulent pulsatile blood flow is seen within the pseudoaneurysm. The likely site of the neck communicating with the adjacent artery is also demonstrated (red arrow)