Ultrasound examination showing multiple steno-occlusive lesions in the cervical vessels. (a) Colour mode examination: RCCA occlusion, no flow in the right common carotid artery, and the vessel lumen is filled with thrombotic material. (b), (c) Duplex mode examination: anterograde flow in the right ICA and retrograde flow in the right ECA. (d) Duplex mode examination, subclavian steal phenomenon, and retrograde flow in the right vertebral artery. (e), (f) Colour mode and duplex mode examination and severe left internal carotid artery stenosis.
