Summary
We observed a rare cerebrovascular anomaly in a patient with brain-stem infarction. Two right vertebral arteries arose from the subclavian artery and communicated directly with each other under the transverse foramen of the fourth cervical vertebra. The left vertebral artery consisted of a rudimentary artery that arose from the left subclavian artery, ran through the transverse foramen of the sixth cervical vertebra and then tapered down to disappear at the fourth/fifth cervical vertebrae, plus a second, accessory artery that arose from a branch of the left thyrocervical trunk, ran through the transverse foramen of the fifth cervical vertebra and tapered off to disappear at the first/second cervical vertebrae.
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Takasato, Y., Hayashi, H., Kobayashi, T. et al. Duplicated origin of right vertebral artery with rudimentary and accessory left vertebral arteries. Neuroradiology 34, 287–289 (1992). https://doi.org/10.1007/BF00588183
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DOI: https://doi.org/10.1007/BF00588183