Fenestration of the vertebral artery, different from duplication, is a rare vascular variation, which can be usually classified into extracranial, intracranial and extracranial-intracranial types.

• 窗式椎动脉是一种较为少见的血管变异,它与双椎动脉为两种不同的变异类型,通常可分为颅外型、内型和颅内-外型。