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. 2020 Mar 11;14:775–793. doi: 10.2147/OPTH.S243203

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© 2020 Dammacco et al.

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(A) Color Doppler ultrasonography (CDUS): longitudinal scan reveals a hypoechoic plaque in the proximal internal carotid artery. (B) CDUS of the right temporal artery shows a hypoechoic halo around the lumen in transverse view (arrow). (C) CDUS of the right temporal artery shows a hypoechoic halo around the lumen in transverse view (arrow). The halo sign corresponds to edema of the artery wall. (D) Longitudinal view of the right temporal artery by CDUS shows a hypoechoic halo of the temporal artery and the presence of turbulent and weak flow, suggesting the presence of stenosis. The peak systolic velocity is 1 m/s, that is double compared to the segment without stenosis.