Fig. 1

Imaging at the first visit. a Brain time-of-flight imaging magnetic resonance angiography (TOF-MRA) showed stenosis of the right internal carotid artery (ICA) in the C1 segments with a focus filling defect (white arrow); the lumen of the right ICA in the C2 and C3 segments had become narrow; b On TOF-MRA, the native source image showed that the right ICA was divided into two lumens by an intimal flap; c Sagittal imaging (black-blood T1WI) showed intimal flaps within the lumen and a hyperintense intravascular haematoma in the right ICA; d Cervical TOF-MRA showed a narrowing lumen of the C1 segment of the right ICA (white dotted line arrow) and an intravascular haematoma (white arrow); e Digital subtraction angiography (DSA) showed a “line-like” sign at the distal portion of the C1 segment of the right ICA (white arrow). f DSA showed the “string-of beads” appearance in the distal part of the C1 segment of the left ICA (white arrow).