case_images: PMC3900268_01
case_images: MRA and CEMRA images of case 1 (A-D) and case 2 (E-H). No abnormality was observed in the internal carotid arteries. A, E) Angiograms show tortuosity of the basilar artery. B, F) CEMRA images show bilateral tortuosity in the V1-V2 segment of the vertebral artery, and bilateral spiral twisting in the V4 segments of the vertebral arteries without obvious stenosis. C, G) Cross-sectional images of MRA show that the left and right vertebral arteries lie adjacent to each other. D, H) Acute brain infarction is not observed.
case_images: 1471-2377-14-14-1.jpg
case_images: PMC3900268_02_1471-2377-14-14-1.jpg
case_images: F1
case_images: Cervical CEMRA showed bilateral looping in the V2 segments of the vertebral arteries, and bilateral spiral twisting in the V4 segments of the vertebral arteries without obvious atherosclerotic stenosis (Figure 1E-H).
case_images: PMC3900268_02
case_images: MRA and CEMRA images of case 1 (A-D) and case 2 (E-H). No abnormality was observed in the internal carotid arteries. A, E) Angiograms show tortuosity of the basilar artery. B, F) CEMRA images show bilateral tortuosity in the V1-V2 segment of the vertebral artery, and bilateral spiral twisting in the V4 segments of the vertebral arteries without obvious stenosis. C, G) Cross-sectional images of MRA show that the left and right vertebral arteries lie adjacent to each other. D, H) Acute brain infarction is not observed.
case_images: 1471-2377-14-14-1.jpg
case_images: PMC3900268_02_1471-2377-14-14-1.jpg
case_images: F1
case_images: Cervical CEMRA showed bilateral looping in the V2 segments of the vertebral arteries, and bilateral spiral twisting in the V4 segments of the vertebral arteries without obvious atherosclerotic stenosis (Figure 1E-H).