Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Right brachiocephalic injection demonstrating lack of right VA origin. b, c Lateral view injections of the right deep cervical artery demonstrate transient opacification of the right VA (white arrow) via the C2 muscular anastomosis, proving that the right vertebral must be present.
