Split internal jugular vein: surgical and radiological implications

The close association of the internal jugular vein (IJV) with the lower four cranial nerves, carotid vessels, and deep cervical lymph nodes makes it functionally, surgically, and radiologically important. Variants of the IJV are rare, and even less commonly, it could be absent. Partial or complete duplication of the vein have been reported, and occasionally it has had fenestrations along its course, with the spinal accessory nerve passing through the fenestration.

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