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Fig. 1

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Axial T1 section through the C4/5 intervertebral foramen. The left vertebral artery (in cross-section) demonstrates marked high signal intensity anteriorly (arrowheads) with a lesser degree of high signal posteriorly. This is due to a combination of extra-cellular and intracellular methemoglobin in the vessel wall. The expanded vessel fills the foramen compressing the exiting C5 root (arrow).