Ultrasound examination showing hypoplastic and occluded right CCA. (a) Colour mode examination: RCCA occlusion, no flow in the right common carotid artery, the vessel lumen is filled with thrombotic material, and the vessel diameter is 3.8 mm. (b), (c) Duplex mode examination: anterograde flow in the right ICA and retrograde flow in the right ECA.
