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Figure 3: Variations in the size of vertebral artery (VA): (a) bilateral equal sized VA (type1a); (b) bilateral asymmetrical VA with adequate lumen and left-sided dominance (long thin arrow; type 1b); (c) bilateral asymmetrical VA with left-sided hypoplasia (thick arrow; type 1c); (d) bilateral asymmetrical VA with left-sided aplasia (angled arrow; type 1d)

Figure 3: Variations in the size of vertebral artery (VA): (a) bilateral equal sized VA (type1a); (b) bilateral asymmetrical VA with adequate lumen and left-sided dominance (long thin arrow; type 1b); (c) bilateral asymmetrical VA with left-sided hypoplasia (thick arrow; type 1c); (d) bilateral asymmetrical VA with left-sided aplasia (angled arrow; type 1d)