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We investigated diameters of prevertebral - V1, and atlantic - V3 parts of extradural segment of vertebral artery (VA). Variable results from the literaturę about VA diameters reflect variety of diagnostic and imaging methods, various sample sizes, different levels of measurements, and lack of possible specific ethnic, regional or genetic data. Additionally, the data are often without distinctions of left-right or of sex.

Sex and level differences in the diameters of extradural segment of vertebral artery: computed tomography angiographic study