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Figure 5: Vertebral artery (VA) anomalies: (a) Cranial entry site from a congenital foramen between the occiput and occipitalized atlas (thin arrow; type 2b); (b) persistent first intersegmental artery (type 2c) in a nonoccipitalized atlas with medial loop (type 3b; circular curved arrow); (c) persistent first intersegmental artery with an occipitalized atlas (angled arrow; type 2c); and (d) fenestrated VA (thick arrow; type 2d)

Figure 5: Vertebral artery (VA) anomalies: (a) Cranial entry site from a congenital foramen between the occiput and occipitalized atlas (thin arrow; type 2b); (b) persistent first intersegmental artery (type 2c) in a nonoccipitalized atlas with medial loop (type 3b; circular curved arrow); (c) persistent first intersegmental artery with an occipitalized atlas (angled arrow; type 2c); and (d) fenestrated VA (thick arrow; type 2d)