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Grey-scale images of left CCA shows lumen to be filled with echogenic thrombus. Colour imaging failed to show flow. Colour Doppler image of left carotid bifurcation reveals both internal carotid artery (ICA) and external carotid artery (ECA) to be patent. Colour Doppler images with spectral Doppler tracings show flow in ECA is reversed while flow in ICA remains anterograde.